文献类型：期刊文献

中文题名：模拟增雨对荒漠区白刺叶片和土壤化学计量性状变化的影响

英文题名：Effects of simulated rainfall enhancement on the leaf and soil stoichiometric trait of Nitraria tangutorum in desert area

作者：牧仁[1,2] 张景波[1,2] 董雪[1,2] 王丹阳[1,2] 刘雅婧[1,2] 包海龙[3] 李新乐[1,2]

第一作者：牧仁

机构：[1]中国林业科学研究院沙漠林业实验中心,巴彦淖尔015200;[2]中国林业科学研究院内蒙古磴口荒漠生态系统定位观测研究站,巴彦淖尔015200;[3]蒙草生态环境(集团)股份有限公司草原生态系统研究院,呼和浩特010070

年份：2026

卷号：46

期号：2

起止页码：901-915

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2024MA049);中央引导地方科技发展资金(2022ZY0177);内蒙古自治区自然科学基金项目(2024MS03067)。

语种：中文

中文关键词：降水;生态化学计量性状;荒漠生态系统;白刺;叶片

外文关键词：precipitation;stoichiometric trait;desert ecosystem;nitraria tangutorum;leaves

分类号：S793.9;S714.2

摘要：降水是影响荒漠区植物功能性状和生态系统功能的关键因素。在全球气候变暖形势下,中国荒漠区降水量呈现增加趋势,而这些地区植物和土壤化学计量性状对降水变化的响应特点尚不清楚。选择乌兰布和沙漠白刺(Nitraria tangutorum)灌丛为研究对象,开展增雨试验,探究长期增雨对植物叶片及土壤生态化学计量影响。在2008—2022年间实施,设置5个增雨处理,即自然降水(R0)和增雨25%(R1)、50%(R2)、75%(R3)、100%(R4)等处理水平。试验结果表明,1)增雨能显著提高白刺叶片总碳(TC)和总磷(TP)含量(P<0.05),而随增雨强度增加,叶片总氮(TN)含量呈先降后升格局,在R1处理下叶片C/P和N/P值达到最小值,较R0处理分别减少35.79%和38.49%(P<0.05);2)除土壤AN外,增雨显著提高了表层土壤元素含量和化学计量比值,0—2 cm土层有效磷(AP)含量和2—10 cm土层C/P和N/P均在R4处理达到最大值,较R0处理分别增加58.21%、31.46%和70.56%(P<0.05);3)在增雨处理下,土壤N/P和pH是影响白刺叶片化学计量性状的主要因素。此外,白刺叶片TC含量对气象因子的响应最为强烈,F值为4.288。叶片TC、TN、TP和N/P值主要受空气湿度的影响,C/N和C/P值主要受地表温度的影响。研究结果提供了荒漠区植物生态系统长期增雨试验案例,也对气候变化影响下荒漠区植物生态系统经营具有重要的指导意义。
Rainfall is one of key factors influencing plant functional traits and ecosystem function in desert regions.Under the situation of global warming,the precipitation in desert areas of China shows an increasing trend,but the response characteristics of plant and soil stoichiometric trait to precipitation in these areas are not clear.In this study,Nitraria tangutorum shrub in UlanBuh Desert was selected as the research object to conduct precipitation enhancement experiment to explore the effect of long-term rainfall enhancement on plant leaves and soil eco stoichiometry.A rainfall manipulation experiment was conducted from 2008 to 2022,with four enhancement precipitation and one CK treatments:natural precipitation(R0,CK)and rainfall increases of 25%(R1),50%(R2),75%(R3),and 100%(R4).The results showed that:1)rainfall enhancement could significantly increased the content of TC and TP in N.tangutorum leaves(P<0.05),and with the increase of rainfall intensity,the content of TN in leaves showed a pattern of decreasing firstly and then increasing.Under R1 treatment,the C/P and N/P of N.tangutorum leaves reached the minimum,which were 35.79%and 38.49%lower than those under R0 treatment,respectively(P<0.05);2)Rainfall increased the element content and stoichiometric ratio of topsoil significantly.AP content in 0—2 cm soil layer and C/P and N/P in 2—10 cm soil layer reached the maximum in R4 treatment,which increased by 58.21%,31.46%and 70.56%respectively compared with R0 treatment(P<0.05);3)Soil N/P and pH were the main factors affecting the stoichiometric trait of N.tangutorum leaves under rainfall enhancement treatments.In addition,the response of leaf TC content of N.tangutorum to meteorological factors was the strongest,which F value is 4.288.The leaf TC,TN,TP and N/P of N.tangutorum were mainly affected by air humidity,and the C/N and C/P were mainly affected by surface temperature.These results provide a long-term rainfall enhancement test case of plant ecosystem in desert area and also have important guiding significance under the situation of climate change.