草业学报 ›› 2022, Vol. 31 ›› Issue (10): 18-27.DOI: 10.11686/cyxb2021412
程燕明1,2(), 马红彬1,2(), 马菁1,2, 马子元1,2, 刘进娣1,2, 周瑶1,2, 彭文栋3
收稿日期:
2021-11-10
修回日期:
2022-01-10
出版日期:
2022-10-20
发布日期:
2022-09-14
通讯作者:
马红彬
作者简介:
E-mail: ma_hb@nxu.edu.cn基金资助:
Yan-ming CHENG1,2(), Hong-bin MA1,2(), Jing MA1,2, Zi-yuan MA1,2, Jin-di LIU1,2, Yao ZHOU1,2, Wen-dong PENG3
Received:
2021-11-10
Revised:
2022-01-10
Online:
2022-10-20
Published:
2022-09-14
Contact:
Hong-bin MA
摘要:
研究放牧对草地碳氮储量及固持的影响对草地科学管理具有重要意义。以宁夏荒漠草原为对象,研究了封育、自由放牧和暖季轮牧下0~40 cm土壤有机碳和全氮储量及碳氮固持特征。结果表明:1) 经过5年放牧,土壤碳氮含量暖季轮牧最高,分别为5.66±0.32 g·kg-1和0.32±0.01 g·kg-1,自由放牧最低。随土层的加深,有机碳含量在暖季轮牧处理中增加,封育和自由放牧变化不显著;氮含量3种处理垂直变化均不显著。自由放牧碳氮比最高,达到26.98±1.05,暖季轮牧最低。0~40 cm土壤碳氮储量表现为暖季轮牧>封育>自由放牧。2)以封育为对照,碳氮固持量和固持速率呈暖季轮牧>封育>自由放牧。3)Pearson相关性分析表明,土壤碳氮储量、固持与地上生物量呈显著相关性(P<0.05);与物种多样性呈极显著正相关(P<0.01,P<0.001)。研究认为,从土壤碳氮储量及固持考虑,暖季轮牧的草地利用方式更有利于研究区荒漠草原碳汇能力提升和草地持续发展。
程燕明, 马红彬, 马菁, 马子元, 刘进娣, 周瑶, 彭文栋. 不同放牧方式对荒漠草原土壤碳氮储量及固持的影响[J]. 草业学报, 2022, 31(10): 18-27.
Yan-ming CHENG, Hong-bin MA, Jing MA, Zi-yuan MA, Jin-di LIU, Yao ZHOU, Wen-dong PENG. Effects of different grazing patterns on soil carbon and nitrogen storage and sequestration in desert steppee[J]. Acta Prataculturae Sinica, 2022, 31(10): 18-27.
处理 Treatments | 有机碳 Organic carbon (g·kg-1) | 全氮 Total nitrogen (g·kg-1) | 容重 Bulk density (g·cm-3) | 盖度 Coverage (%) | 地上生物量 Aboveground biomass (g·m-2) | 多样性 H' diversity |
---|---|---|---|---|---|---|
EG | 4.57±0.50a | 0.24±0.03a | 1.40±0.05a | 53.00±4.24a | 30.44±6.11a | 2.55±0.08a |
FG | 4.31±0.25a | 0.23±0.00a | 1.41±0.04a | 51.50±3.61a | 30.85±13.42a | 2.27±0.09a |
WG | 4.92±0.37a | 0.23±0.00a | 1.41±0.04a | 52.50±2.71a | 30.26±9.89a | 2.38±0.20a |
表1 试验前样地土壤性状
Table 1 Soil properties of sample plots before test
处理 Treatments | 有机碳 Organic carbon (g·kg-1) | 全氮 Total nitrogen (g·kg-1) | 容重 Bulk density (g·cm-3) | 盖度 Coverage (%) | 地上生物量 Aboveground biomass (g·m-2) | 多样性 H' diversity |
---|---|---|---|---|---|---|
EG | 4.57±0.50a | 0.24±0.03a | 1.40±0.05a | 53.00±4.24a | 30.44±6.11a | 2.55±0.08a |
FG | 4.31±0.25a | 0.23±0.00a | 1.41±0.04a | 51.50±3.61a | 30.85±13.42a | 2.27±0.09a |
WG | 4.92±0.37a | 0.23±0.00a | 1.41±0.04a | 52.50±2.71a | 30.26±9.89a | 2.38±0.20a |
图1 土壤有机碳和全氮含量剖面变化特征EG: 封育 Enclosure grazing; FG: 自由放牧 Free grazing; WG: 暖季轮牧 Warm season rotation grazing.不同小写字母表示同一处理不同土层间差异显著(P<0.05),不同大写字母表示处理间差异显著(P<0.05),下同。 Different small letters mean significant differences of the same treatment in different soil layers at 0.05 level,and capital letters mean significant differences among different treatment at 0.05 level, the same below.
Fig.1 Variation characteristics of soil organic carbon and total nitrogen contents in profile
处理 Treatments | 盖度 Coverage (%) | 地上生物量Aboveground biomass (g·m-2) | 多样性H' diversity |
---|---|---|---|
FG | 39.60±15.48b | 37.38±7.14c | 12.60±0.89b |
EG | 53.20±12.62a | 64.69±10.63a | 10.60±1.95c |
WG | 52.50±6.75ab | 58.22±4.23b | 14.37±2.61a |
表2 试验后样地植被特征
Table 2 Vegetation characteristics of the sample plot after test
处理 Treatments | 盖度 Coverage (%) | 地上生物量Aboveground biomass (g·m-2) | 多样性H' diversity |
---|---|---|---|
FG | 39.60±15.48b | 37.38±7.14c | 12.60±0.89b |
EG | 53.20±12.62a | 64.69±10.63a | 10.60±1.95c |
WG | 52.50±6.75ab | 58.22±4.23b | 14.37±2.61a |
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