草业学报 ›› 2023, Vol. 32 ›› Issue (6): 58-70.DOI: 10.11686/cyxb2022267
李思媛1(), 崔雨萱1, 孙宗玖1,2,3(), 刘慧霞1, 冶华薇1
收稿日期:
2022-06-20
修回日期:
2022-09-21
出版日期:
2023-06-20
发布日期:
2023-04-21
通讯作者:
孙宗玖
作者简介:
Corresponding author. E-mail: nmszj@21cn.com基金资助:
Si-yuan LI1(), Yu-xuan CUI1, Zong-jiu SUN1,2,3(), Hui-xia LIU1, Hua-wei YE1
Received:
2022-06-20
Revised:
2022-09-21
Online:
2023-06-20
Published:
2023-04-21
Contact:
Zong-jiu SUN
摘要:
为了厘清封育过程中退化荒漠草地土壤微生物生物量生态化学计量学特征、土壤有机碳积累特征及其关系,对天山北坡新源县、博乐市、玛纳斯县、呼图壁县、奇台县封育4~7年的蒿类荒漠草地0~50 cm土层土壤有机碳(SOC)、土壤微生物生物量碳(MBC)、氮(MBN)、磷(MBP)含量及其化学计量比进行了分析,并用结构方程模型解析了SOC与土壤MBC、MBN、MBP及其化学计量比间的关系。结果表明:1)封育后0~50 cm土层蒿类荒漠草地SOC含量较对照显著降低15.52%(P<0.05),而土壤MBC、MBN、MBP、MBC/MBN、MBC/MBP、MBN/MBP总体变化不显著。2)SOC与MBC、MBN、MBP均呈显著正相关(P<0.01),与MBC/MBN、MBC/MBP呈负相关,且封育后SOC与MBN/MBP间的关系由显著正相关转为负相关(P<0.01)。3)结构方程分析表明,土壤MBC、MBN、MBP及其计量比对SOC积累的直接解释率为46%,且MBN对土壤有机碳的作用效应最强(P<0.001),封育降低了土壤MBC、MBN对土壤有机碳积累的影响,增加了土壤MBP的直接影响。总之,封育4~7年对蒿类荒漠草地土壤微生物生物量生态化学计量特征影响不显著,且MBN是影响土壤有机碳积累的主要因素。
李思媛, 崔雨萱, 孙宗玖, 刘慧霞, 冶华薇. 封育对蒿类荒漠草地土壤有机碳及土壤微生物生物量生态化学计量特征的影响[J]. 草业学报, 2023, 32(6): 58-70.
Si-yuan LI, Yu-xuan CUI, Zong-jiu SUN, Hui-xia LIU, Hua-wei YE. Effect of grazing exclusion on soil organic carbon and stoichiometry characteristics of soil microbial biomass in sagebrush desert[J]. Acta Prataculturae Sinica, 2023, 32(6): 58-70.
样地 Site | 新源县 Xinyuan (XY) | 博乐市 Bole (BL) | 玛纳斯县 Manasi (MNS) | 呼图壁县 Hutubi (HTB) | 奇台县 Qitai (QT) |
---|---|---|---|---|---|
地理位置 Geographical position | 43°22′ N,82°36′ E | 44°50′ N,81°39′ E | 44°01′ N,86°09′ E | 43°58′ N,86°32′ E | 43°47′ N,89°25′ E |
年均降水量 Mean annual precipitation (mm) | 204 | 200 | 172 | 224 | 160 |
年均气温 Mean annual temperature (℃) | 7.13 | 6.10 | 8.18 | 6.79 | 7.17 |
海拔 Altitude (m) | 887 | 1110 | 1033 | 978 | 1227 |
封育开始时间Start time of grazing exclusion (Year/month) | 2012/6 | 2014/7 | 2015/7 | 2015/7 | 2012/6 |
土壤基质 Soil texture | 土质 Soil | 砾石质 Gravelly | 土质 Soil | 土质 Soil | 土质 Soil |
优势种 Dominant species | 伊犁绢蒿S. transiliense | 博洛塔绢蒿,木地肤S. borotalalense,K. prostrata | 伊犁绢蒿,叉毛蓬S. transiliense,P. sibirica | 伊犁绢蒿,叉毛蓬S. transiliense,P. sibirica | 伊犁绢蒿,木地肤,短柱苔草S. transiliense,K. prostrata,C. turkestanica |
表1 试验样地基本信息[12]
Table 1 The basic condition of experiment site
样地 Site | 新源县 Xinyuan (XY) | 博乐市 Bole (BL) | 玛纳斯县 Manasi (MNS) | 呼图壁县 Hutubi (HTB) | 奇台县 Qitai (QT) |
---|---|---|---|---|---|
地理位置 Geographical position | 43°22′ N,82°36′ E | 44°50′ N,81°39′ E | 44°01′ N,86°09′ E | 43°58′ N,86°32′ E | 43°47′ N,89°25′ E |
年均降水量 Mean annual precipitation (mm) | 204 | 200 | 172 | 224 | 160 |
年均气温 Mean annual temperature (℃) | 7.13 | 6.10 | 8.18 | 6.79 | 7.17 |
海拔 Altitude (m) | 887 | 1110 | 1033 | 978 | 1227 |
封育开始时间Start time of grazing exclusion (Year/month) | 2012/6 | 2014/7 | 2015/7 | 2015/7 | 2012/6 |
土壤基质 Soil texture | 土质 Soil | 砾石质 Gravelly | 土质 Soil | 土质 Soil | 土质 Soil |
优势种 Dominant species | 伊犁绢蒿S. transiliense | 博洛塔绢蒿,木地肤S. borotalalense,K. prostrata | 伊犁绢蒿,叉毛蓬S. transiliense,P. sibirica | 伊犁绢蒿,叉毛蓬S. transiliense,P. sibirica | 伊犁绢蒿,木地肤,短柱苔草S. transiliense,K. prostrata,C. turkestanica |
图1 封育对蒿类荒漠草地土壤有机碳含量的影响*P<0.05,**P<0.01;a:0~50 cm土层;b:新源样地;c:博乐样地;d:玛纳斯样地;e:呼图壁样地;f:奇台样地;图a右上角为封育对5个样地的总体影响。下同。*P<0.05, **P<0.01. a: 0-50 cm soil layer. b: Xinyuan site. c: Bole site. d: Manasi site. e: Hutubi site. f: Qitai site. The total effect of grazing exclusion on the five sites is shown in the top-right corner of Figure a. The same below.
Fig.1 Effect of grazing exclusion on soil organic carbon in sagebrush desert
封育 Grazing exclusion | 对照Control | ||||||
---|---|---|---|---|---|---|---|
SOC | MBC | MBN | MBP | MBC/MBN | MBC/MBP | MBN/MBP | |
SOC | 1.000 | 0.628** | 0.745** | 0.647** | -0.182* | -0.135 | 0.206** |
MBC | 0.428** | 1.000 | 0.838** | 0.746** | -0.217** | -0.068 | 0.187* |
MBN | 0.572** | 0.798** | 1.000 | 0.871** | -0.392** | -0.182* | 0.283** |
MBP | 0.553** | 0.730** | 0.847** | 1.000 | -0.319** | -0.305** | 0.017 |
MBC/MBN | -0.274** | -0.259** | -0.408** | -0.348** | 1.000 | 0.279** | -0.449** |
MBC/MBP | -0.245** | -0.181* | -0.237** | -0.291** | 0.793** | 1.000 | 0.442** |
MBN/MBP | -0.102 | -0.021 | 0.067 | -0.151 | -0.073 | 0.415** | 1.000 |
表2 封育对荒漠草地土壤有机碳与MBC、MBN、MBP及其化学计量特征的皮尔逊相关性分析
Table 2 Pearson correlation analysis of soil organic carbon (SOC) with soil microbial biomass carbon (MBC), nitrogen (MBN), phosphorus (MBP) and their stoichiometric characteristics in grazing exclusion sagebrush desert grassland
封育 Grazing exclusion | 对照Control | ||||||
---|---|---|---|---|---|---|---|
SOC | MBC | MBN | MBP | MBC/MBN | MBC/MBP | MBN/MBP | |
SOC | 1.000 | 0.628** | 0.745** | 0.647** | -0.182* | -0.135 | 0.206** |
MBC | 0.428** | 1.000 | 0.838** | 0.746** | -0.217** | -0.068 | 0.187* |
MBN | 0.572** | 0.798** | 1.000 | 0.871** | -0.392** | -0.182* | 0.283** |
MBP | 0.553** | 0.730** | 0.847** | 1.000 | -0.319** | -0.305** | 0.017 |
MBC/MBN | -0.274** | -0.259** | -0.408** | -0.348** | 1.000 | 0.279** | -0.449** |
MBC/MBP | -0.245** | -0.181* | -0.237** | -0.291** | 0.793** | 1.000 | 0.442** |
MBN/MBP | -0.102 | -0.021 | 0.067 | -0.151 | -0.073 | 0.415** | 1.000 |
图8 土壤微生物生物量及其化学计量比与有机碳拟合的结构方程模型a:总体;b:封育;c:对照。红色路径表示正效应,蓝色路线表示负效应。箭头的宽度表示因果效应的强度。*P<0.05、**P<0.01、***P<0.001。a: Total; b: Grazing exclusion; c: Control. Red paths show positive effects and blue paths show negative effects. The width of arrows indicates the strength of the causal effect. * P<0.05, ** P<0.01, *** P<0.001.
Fig.8 SEM fitting soil microbial biomass and its stoichiometric ratio with soil organic carbon
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