草业学报 ›› 2026, Vol. 35 ›› Issue (7): 15-31.DOI: 10.11686/cyxb2025234
刘树超1,2,3(
), 邵全琴2,3,4(
), 樊江文2,3, 黄海波2
收稿日期:2025-06-10
修回日期:2025-10-09
出版日期:2026-07-20
发布日期:2026-05-21
通讯作者:
邵全琴
作者简介:Corresponding author. E-mail: shaoqq@igsnrr.ac.cn基金资助:
Shu-chao LIU1,2,3(
), Quan-qin SHAO2,3,4(
), Jiang-wen FAN2,3, Hai-bo HUANG2
Received:2025-06-10
Revised:2025-10-09
Online:2026-07-20
Published:2026-05-21
Contact:
Quan-qin SHAO
摘要:
三江源区作为青藏高原生态安全屏障的核心区域,其可食牧草动态变化对高寒草地可持续利用至关重要。本研究基于多源遥感数据(全球陆表特征参量产品和应用遥感-过程耦合模型GLOPEM CEVSA估算的NPP数据集、Landsat系列卫星影像)、长期草地样方监测数据及气象资料,量化了不同退化梯度下可食牧草比例的时空分异特征,构建了1981-2020年三江源区天然草地可食牧草的产草量数据集。结果表明:1)近40年全区可食牧草比例均值为0.69,呈“下降-波动-回升”趋势,分时段均值依次为0.72(1981-1990)、0.69(1991-2004)、0.66(2005-2012)和0.70(2013-2020),虽经生态工程修复,仍未恢复至80年代初水平;2)1981-2020年,三江源区可食牧草产草量空间上自东向西递减,年均值为403.48 kg·hm-2,年均产草总量为1322.61万t,62.5%区域呈显著增加趋势(P<0.05);3)年均温是可食牧草产草量变化的主控因子,正相关区域占68.3%,降水驱动作用在干旱区(<400 mm)及重度退化区显著增强;4)三江源国家公园内可食牧草产草量整体呈增长趋势,但园区间差异显著,澜沧江源园区年均产草量为399.56 kg·hm-2,高于长江源园区(169.37 kg·hm-2)。本研究分析了气候变暖与降水格局变化对高寒草地可食牧草恢复的差异化调控机制,为三江源区草地适应性管理提供了科学依据。
刘树超, 邵全琴, 樊江文, 黄海波. 1981-2020年三江源区可食牧草时空变化及气候驱动机制研究[J]. 草业学报, 2026, 35(7): 15-31.
Shu-chao LIU, Quan-qin SHAO, Jiang-wen FAN, Hai-bo HUANG. Spatiotemporal dynamics of edible forage and its climatic driving mechanisms in the Three-River Headwaters Region from 1981 to 2020[J]. Acta Prataculturae Sinica, 2026, 35(7): 15-31.
图1 三江源区草地空间分布基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.1 Grassland spatial distribution of the Three-River Headwaters Region
图2 不同NPP数据模拟产草量的精度验证“?”为基于GLASS NPP500数据模拟的产草量,“-”为GLASS NPP500数据模拟产草量的线性趋势线;“▲”为基于GLOPEM CEVSA NPP1000数据模拟的产草量,“……”为GLOPEM CEVSA NPP1000模拟产草量的线性趋势线。“?”indicates the forage yield simulated based on GLASS NPP500 data, “-” indicates linear trend line for simulating forage yield on GLASS NPP500 data, “▲”indicates the simulated forage yield based on GLOPEM CEVSA NPP1000 data, “……”indicates linear trend line for simulating forage yield on GLOPEM CEVSA NPP1000 data.
Fig.2 Validation of simulated forage yield accuracy from different NPP datasets
草地类、亚类、组和型 Grassland class, subclass, group, and type | 植被覆盖度 Vegetation coverage | 产草量干重Dry weight of grass yield (kg·hm-2) | 可食牧草比例Proportion of edible forage |
|---|---|---|---|
| 1.温性草原类 Temperate steppe | - | - | - |
| 1.1 山地草原亚类Mountain grassland subclass | 0.35(0.20~0.60) | 665 | - |
| 1.1.1中禾草组Medium grass group | - | - | - |
| 克氏针茅Stipa krylovii、羊茅Festuca ovina | 0.40 | 301 | - |
| 青海固沙草Orinus kokonorica、杂类草Herbarum variarum | 0.30~0.50 | 532 | - |
| 2.高寒草原类Alpine steppe | 0.20~0.60 | - | - |
| 2.1矮禾草组Dwarf grass group | - | - | - |
| 紫花针茅Stipa purpurea | 0.30~0.50 | 255 | - |
| 紫花针茅S. purpurea、杂类草Herbarum variarum | 0.30~0.50 | 255 | - |
| 3.高寒草甸类 Alpine meadow | - | - | - |
| 3.1高寒草甸亚类Alpine meadow subclass | 0.80~0.90 | - | - |
| 3.1.1小莎草组Small sedge group | - | - | - |
| 矮生嵩草Kobresia humilis | 0.80~0.90 | 831 | 0.93 |
| 高山嵩草Kobresia pygmaea | 0.80~0.90 | 562 | 0.85 |
| 禾叶嵩草Kobresia graminifolia | 0.70~0.90 | 968 | - |
| 线叶嵩草Kobresia capillifolia | 0.70~0.90 | 1212 | 0.85 |
| 线叶嵩草K. capillifolia、杂类草Herbarum variarum | 0.60~0.90 | 1610 | 0.83 |
| 3.2沼泽化高寒草甸亚类Swampy alpine meadow subclass | 0.70~0.95 | - | - |
| 3.2.1大莎草组Large sedge group | - | - | - |
| 西藏嵩草Kobresia tibetica | >0.90 | 980 | 0.93 |
表1 20世纪80年代三江源区部分草地资源统计
Table 1 Statistical of grassland resources in the Three-River Headwaters Region in the 1980s
草地类、亚类、组和型 Grassland class, subclass, group, and type | 植被覆盖度 Vegetation coverage | 产草量干重Dry weight of grass yield (kg·hm-2) | 可食牧草比例Proportion of edible forage |
|---|---|---|---|
| 1.温性草原类 Temperate steppe | - | - | - |
| 1.1 山地草原亚类Mountain grassland subclass | 0.35(0.20~0.60) | 665 | - |
| 1.1.1中禾草组Medium grass group | - | - | - |
| 克氏针茅Stipa krylovii、羊茅Festuca ovina | 0.40 | 301 | - |
| 青海固沙草Orinus kokonorica、杂类草Herbarum variarum | 0.30~0.50 | 532 | - |
| 2.高寒草原类Alpine steppe | 0.20~0.60 | - | - |
| 2.1矮禾草组Dwarf grass group | - | - | - |
| 紫花针茅Stipa purpurea | 0.30~0.50 | 255 | - |
| 紫花针茅S. purpurea、杂类草Herbarum variarum | 0.30~0.50 | 255 | - |
| 3.高寒草甸类 Alpine meadow | - | - | - |
| 3.1高寒草甸亚类Alpine meadow subclass | 0.80~0.90 | - | - |
| 3.1.1小莎草组Small sedge group | - | - | - |
| 矮生嵩草Kobresia humilis | 0.80~0.90 | 831 | 0.93 |
| 高山嵩草Kobresia pygmaea | 0.80~0.90 | 562 | 0.85 |
| 禾叶嵩草Kobresia graminifolia | 0.70~0.90 | 968 | - |
| 线叶嵩草Kobresia capillifolia | 0.70~0.90 | 1212 | 0.85 |
| 线叶嵩草K. capillifolia、杂类草Herbarum variarum | 0.60~0.90 | 1610 | 0.83 |
| 3.2沼泽化高寒草甸亚类Swampy alpine meadow subclass | 0.70~0.95 | - | - |
| 3.2.1大莎草组Large sedge group | - | - | - |
| 西藏嵩草Kobresia tibetica | >0.90 | 980 | 0.93 |
图3 三江源区天然草地不同时段退化程度空间分布a~d分别为1990、2004、2012和2020年草地退化程度的空间分布,基于自然资源部标准地图服务网站GS(2020)4619号标准地图制作,底图边界无修改。a-d represents the spatial distribution of grassland degradation in 1990, 2004, 2012, and 2020, respectively. Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.3 Spatial distribution of natural grassland degradation at different time in the Three-River Headwaters Region
草地类、亚类、组和型 Grassland class, subclass, group, and type | 年份Year | |||
|---|---|---|---|---|
| 1990 | 2004 | 2012 | 2019 | |
| 1.温性草原类Temperate steppe | 0.95 | 0.95 | 0.89 | 0.94 |
| 1.1 山地草原亚类Mountain grassland subclass | 0.95 | 0.95 | 0.89 | 0.94 |
| 1.1.1中禾草组Medium grass group | 0.95 | 0.95 | 0.89 | 0.94 |
| 克氏针茅S. krylovii、羊茅F. ovina | 0.99 | 0.99 | 0.93 | 0.98 |
| 青海固沙草O. kokonorica、杂类草Herbarum variarum | 0.91 | 0.91 | 0.90 | 0.97 |
| 2.高寒草原类Alpine steppe | 0.83 | 0.83 | 0.78 | 0.82 |
| 2.1矮禾草组Dwarf grass group | 0.83 | 0.83 | 0.78 | 0.82 |
| 紫花针茅S. purpurea | 0.87 | 0.86 | 0.81 | 0.85 |
| 紫花针茅S. purpurea、杂类草Herbarum variarum | 0.80 | 0.79 | 0.75 | 0.79 |
| 3.高寒草甸类Alpine meadow | 0.82 | 0.80 | 0.75 | 0.79 |
| 3.1高寒草甸亚类Alpine meadow subclass | 0.79 | 0.77 | 0.75 | 0.76 |
| 3.1.1小莎草组Small sedge group | 0.79 | 0.77 | 0.75 | 0.76 |
| 矮生嵩草K. humilis | 0.93 | 0.90 | 0.85 | 0.89 |
| 高山嵩草K. pygmaea | 0.85 | 0.82 | 0.77 | 0.75 |
| 高山嵩草K. pygmaea、矮生嵩草K. humilis | 0.97 | 0.96 | 0.90 | 0.95 |
| 高山嵩草K. pygmaea、异针茅Stipa aliena | 0.81 | 0.79 | 0.75 | 0.78 |
| 高山嵩草K. pygmaea、圆穗蓼Polygonum macrophyllum | 0.88 | 0.86 | 0.80 | 0.84 |
| 高山嵩草K. pygmaea、杂类草Herbarum variarum | 0.79 | 0.76 | 0.75 | 0.76 |
| 线叶嵩草K. capillifolia、珠芽蓼Polygonum viviparum | 0.87 | 0.85 | 0.80 | 0.84 |
| 黑褐苔草Carex atrofusca、杂类草Herbarum variarum | 0.95 | 0.93 | 0.87 | 0.91 |
| 具金露梅的矮生嵩草K. humilis | 0.88 | 0.86 | 0.81 | 0.85 |
| 线叶嵩草K. capillifolia、高山早熟禾Poa alpigena | 0.81 | 0.79 | 0.75 | 0.78 |
| 禾叶嵩草K. graminifolia | 0.80 | 0.78 | 0.75 | 0.77 |
| 线叶嵩草K. capillifolia | 0.78 | 0.76 | 0.75 | 0.75 |
| 线叶嵩草K. capillifolia、杂类草Herbarum variarum | 0.83 | 0.79 | 0.75 | 0.79 |
| 3.2沼泽化高寒草甸亚类Swampy alpine meadow subclass | 0.93 | 0.97 | 0.91 | 0.96 |
| 3.2.1大莎草组Large sedge group | 0.93 | 0.97 | 0.91 | 0.96 |
| 西藏嵩草K. tibetica | 0.93 | 0.97 | 0.91 | 0.96 |
| 4.沼泽类Swamp | 0.76 | 0.76 | 0.75 | 0.75 |
| 4.1.1大莎草组Large sedge group | 0.76 | 0.76 | 0.75 | 0.75 |
| 木里苔草Carex muliensis | 0.76 | 0.76 | 0.75 | 0.75 |
| 5.高寒荒漠类Alpine desert | 0.76 | 0.75 | 0.75 | 0.75 |
| 5.1.1半灌木组Semi-shrub group | 0.76 | 0.75 | 0.75 | 0.75 |
| 垫状驼绒藜Krascheninnikovia compacta | 0.76 | 0.75 | 0.75 | 0.75 |
表2 三江源区未退化草地可食牧草比例统计
Table 2 Statistical of the proportion of edible forage in non-degraded natural grassland in the Three-River Headwaters Region
草地类、亚类、组和型 Grassland class, subclass, group, and type | 年份Year | |||
|---|---|---|---|---|
| 1990 | 2004 | 2012 | 2019 | |
| 1.温性草原类Temperate steppe | 0.95 | 0.95 | 0.89 | 0.94 |
| 1.1 山地草原亚类Mountain grassland subclass | 0.95 | 0.95 | 0.89 | 0.94 |
| 1.1.1中禾草组Medium grass group | 0.95 | 0.95 | 0.89 | 0.94 |
| 克氏针茅S. krylovii、羊茅F. ovina | 0.99 | 0.99 | 0.93 | 0.98 |
| 青海固沙草O. kokonorica、杂类草Herbarum variarum | 0.91 | 0.91 | 0.90 | 0.97 |
| 2.高寒草原类Alpine steppe | 0.83 | 0.83 | 0.78 | 0.82 |
| 2.1矮禾草组Dwarf grass group | 0.83 | 0.83 | 0.78 | 0.82 |
| 紫花针茅S. purpurea | 0.87 | 0.86 | 0.81 | 0.85 |
| 紫花针茅S. purpurea、杂类草Herbarum variarum | 0.80 | 0.79 | 0.75 | 0.79 |
| 3.高寒草甸类Alpine meadow | 0.82 | 0.80 | 0.75 | 0.79 |
| 3.1高寒草甸亚类Alpine meadow subclass | 0.79 | 0.77 | 0.75 | 0.76 |
| 3.1.1小莎草组Small sedge group | 0.79 | 0.77 | 0.75 | 0.76 |
| 矮生嵩草K. humilis | 0.93 | 0.90 | 0.85 | 0.89 |
| 高山嵩草K. pygmaea | 0.85 | 0.82 | 0.77 | 0.75 |
| 高山嵩草K. pygmaea、矮生嵩草K. humilis | 0.97 | 0.96 | 0.90 | 0.95 |
| 高山嵩草K. pygmaea、异针茅Stipa aliena | 0.81 | 0.79 | 0.75 | 0.78 |
| 高山嵩草K. pygmaea、圆穗蓼Polygonum macrophyllum | 0.88 | 0.86 | 0.80 | 0.84 |
| 高山嵩草K. pygmaea、杂类草Herbarum variarum | 0.79 | 0.76 | 0.75 | 0.76 |
| 线叶嵩草K. capillifolia、珠芽蓼Polygonum viviparum | 0.87 | 0.85 | 0.80 | 0.84 |
| 黑褐苔草Carex atrofusca、杂类草Herbarum variarum | 0.95 | 0.93 | 0.87 | 0.91 |
| 具金露梅的矮生嵩草K. humilis | 0.88 | 0.86 | 0.81 | 0.85 |
| 线叶嵩草K. capillifolia、高山早熟禾Poa alpigena | 0.81 | 0.79 | 0.75 | 0.78 |
| 禾叶嵩草K. graminifolia | 0.80 | 0.78 | 0.75 | 0.77 |
| 线叶嵩草K. capillifolia | 0.78 | 0.76 | 0.75 | 0.75 |
| 线叶嵩草K. capillifolia、杂类草Herbarum variarum | 0.83 | 0.79 | 0.75 | 0.79 |
| 3.2沼泽化高寒草甸亚类Swampy alpine meadow subclass | 0.93 | 0.97 | 0.91 | 0.96 |
| 3.2.1大莎草组Large sedge group | 0.93 | 0.97 | 0.91 | 0.96 |
| 西藏嵩草K. tibetica | 0.93 | 0.97 | 0.91 | 0.96 |
| 4.沼泽类Swamp | 0.76 | 0.76 | 0.75 | 0.75 |
| 4.1.1大莎草组Large sedge group | 0.76 | 0.76 | 0.75 | 0.75 |
| 木里苔草Carex muliensis | 0.76 | 0.76 | 0.75 | 0.75 |
| 5.高寒荒漠类Alpine desert | 0.76 | 0.75 | 0.75 | 0.75 |
| 5.1.1半灌木组Semi-shrub group | 0.76 | 0.75 | 0.75 | 0.75 |
| 垫状驼绒藜Krascheninnikovia compacta | 0.76 | 0.75 | 0.75 | 0.75 |
图4 三江源区各草地型可食牧草比例空间分布a~d分别为1990、2004、2012和2019年可食牧草比例空间分布,基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。a-d represent spatial distribution of the proportion of edible forage in 1990, 2004, 2012 and 2019, respectively. Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.4 Spatial distribution of the proportion of edible forage in the Three-River Headwaters Region
图5 2020年三江源区天然草地可食牧草产草量空间分布基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.5 Spatial distribution of edible forage yield of natural grassland in the Three-River Headwaters Region in 2020
图6 1981-2020年三江源区天然草地可食牧草平均产草量空间分布基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.6 Spatial distribution of average edible forage yield of natural grassland in the Three-River Headwaters Region from 1981 to 2020
图7 1981-2020年三江源区天然草地可食牧草产草量年际变化
Fig.7 Interannual variation of edible forage yield in natural grassland in the Three-River Headwaters Region from 1981 to 2020
图8 1981-2020年三江源区可食牧草产草量年变化速率(a)及显著性检验(b)基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.8 Annual change rate (a) and significance test (b) of edible forage yield in the Three-River Headwaters Region from 1981 to 2020
县、镇名称 County and town names | 可食牧草产草量 Edible forage yield (kg·hm-2) | 可食牧草产草总量 Total yield of edible forage (×104 t) | 可食牧草比例 Proportion of edible forage | 年变化速率 Annual rate of change (kg·hm-2·a-1) |
|---|---|---|---|---|
| 班玛县Banma county | 666.53 | 38.50 | 0.61 | 1.11 |
| 久治县Jiuzhi county | 717.78 | 56.11 | 0.67 | 1.40 |
| 甘德县Gande county | 657.17 | 44.72 | 0.70 | 1.38 |
| 玛沁县Maqin county | 612.34 | 72.76 | 0.76 | 1.89 |
| 玛多县Maduo county | 278.62 | 60.56 | 0.64 | 1.18 |
| 达日县Dari county | 367.88 | 51.37 | 0.46 | 0.52 |
| 同德县Tongde county | 953.84 | 36.28 | 0.75 | 1.59 |
| 贵德县Guide county | 772.37 | 23.62 | 0.84 | 1.24 |
| 共和县Gonghe county | 599.44 | 73.09 | 0.85 | 3.73 |
| 兴海县Xinghai county | 618.10 | 66.81 | 0.79 | 2.61 |
| 贵南县Guinan county | 868.33 | 45.72 | 0.82 | 2.30 |
| 泽库县Zeku county | 848.91 | 51.74 | 0.67 | 1.55 |
| 河南蒙古族自治县Henan Mongolian Autonomous county | 1088.47 | 69.13 | 0.79 | 1.75 |
| 同仁县Tongren county | 916.98 | 17.21 | 0.81 | 2.83 |
| 尖扎县Jianzha county | 900.68 | 10.69 | 0.79 | 1.59 |
| 囊谦县Nangqian county | 644.49 | 69.98 | 0.66 | 0.41 |
| 玉树市Yushu City | 636.85 | 92.94 | 0.69 | 1.35 |
| 杂多县Zaduo county | 367.91 | 117.48 | 0.65 | 2.02 |
| 称多县Chenduo county | 438.60 | 61.36 | 0.64 | 0.96 |
| 曲麻莱县Qumarlêb county | 208.90 | 87.80 | 0.65 | 0.88 |
| 治多县Zhiduo county | 192.36 | 113.03 | 0.66 | 0.75 |
| 唐古拉山镇Tanggula mountain town | 166.73 | 61.73 | 0.81 | 1.42 |
表3 1981-2020年三江源区县、镇可食牧草产草量统计
Table 3 Statistics of edible forge yield in counties and towns of the Three-River Headwaters Region from 1981 to 2020
县、镇名称 County and town names | 可食牧草产草量 Edible forage yield (kg·hm-2) | 可食牧草产草总量 Total yield of edible forage (×104 t) | 可食牧草比例 Proportion of edible forage | 年变化速率 Annual rate of change (kg·hm-2·a-1) |
|---|---|---|---|---|
| 班玛县Banma county | 666.53 | 38.50 | 0.61 | 1.11 |
| 久治县Jiuzhi county | 717.78 | 56.11 | 0.67 | 1.40 |
| 甘德县Gande county | 657.17 | 44.72 | 0.70 | 1.38 |
| 玛沁县Maqin county | 612.34 | 72.76 | 0.76 | 1.89 |
| 玛多县Maduo county | 278.62 | 60.56 | 0.64 | 1.18 |
| 达日县Dari county | 367.88 | 51.37 | 0.46 | 0.52 |
| 同德县Tongde county | 953.84 | 36.28 | 0.75 | 1.59 |
| 贵德县Guide county | 772.37 | 23.62 | 0.84 | 1.24 |
| 共和县Gonghe county | 599.44 | 73.09 | 0.85 | 3.73 |
| 兴海县Xinghai county | 618.10 | 66.81 | 0.79 | 2.61 |
| 贵南县Guinan county | 868.33 | 45.72 | 0.82 | 2.30 |
| 泽库县Zeku county | 848.91 | 51.74 | 0.67 | 1.55 |
| 河南蒙古族自治县Henan Mongolian Autonomous county | 1088.47 | 69.13 | 0.79 | 1.75 |
| 同仁县Tongren county | 916.98 | 17.21 | 0.81 | 2.83 |
| 尖扎县Jianzha county | 900.68 | 10.69 | 0.79 | 1.59 |
| 囊谦县Nangqian county | 644.49 | 69.98 | 0.66 | 0.41 |
| 玉树市Yushu City | 636.85 | 92.94 | 0.69 | 1.35 |
| 杂多县Zaduo county | 367.91 | 117.48 | 0.65 | 2.02 |
| 称多县Chenduo county | 438.60 | 61.36 | 0.64 | 0.96 |
| 曲麻莱县Qumarlêb county | 208.90 | 87.80 | 0.65 | 0.88 |
| 治多县Zhiduo county | 192.36 | 113.03 | 0.66 | 0.75 |
| 唐古拉山镇Tanggula mountain town | 166.73 | 61.73 | 0.81 | 1.42 |
图9 三江源区天然草地可食牧草不同时段平均产草量空间分布a~d分别为1981-1990年、1991-2004年、2005-2012年和2013-2020年的可食牧草年均产草量,基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。a-d represents the average annual yield of edible forage from 1981 to 1990, 1991 to 2004, 2005 to 2012, and 2013 to 2020, respectively. Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified. 下同The same below.
Fig.9 Spatial distribution of average edible forage yield at different time periods in natural grassland in the Three-River Headwaters Region
图10 三江源区天然草地可食牧草不同时段产草量变化速率空间分布a~d分别为1981-1990年、1991-2004年、2005-2012年和2013-2020年可食牧草产草量的年变化速率,基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。a-d represents the annual change rate of edible forage yield from 1981 to 1990, 1991 to 2004, 2005 to 2012, and 2013 to 2020, respectively. Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.10 Spatial distribution of change rate of edible forage yield in natural grassland at different periods in the Three-River Headwaters Region
图11 可食牧草产草量与年均降水(a)、年均温(b)的相关性基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.11 Correlation between edible forage yield and annual precipitation (a) and annual average temperature (b)
图12 降水和气温对可食牧草产草量相对重要性的空间分布基于自然资源部标准地图服务网站 GS(2020)4619号标准地图制作,底图边界无修改。Based on the standard map service website GS(2020)4619 of the Ministry of Natural Resources, the boundary of the base map is not modified.
Fig.12 Spatial distribution of the relative importance of precipitation and temperature on the yield of edible forage
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