文献类型： 外文期刊

作者： Li, Ying ¹ ; Sang, Jianhui ¹ ; Zou, Canwei ¹ ; Zhang, Qingping ² ; Yang, Qian ¹ ; Xu, Gang ¹ ; Kim, Dong-Gill ³ ; Denton, Matthew D. ⁴ ; Carmona, Carmen Rosa ⁵ ; Zhao, Hongyang ⁶ ; Mao, Yanting ⁷ ; Mao, Liping ¹ ; Wu, Keren ⁸ ; Yao, Bin ⁹ ; Xue, Jianming ¹⁰ ; Sun, Wentao ¹ ; Xiang, Yangzhou ¹¹ ; Li, Yuan ¹ ; Zhu, Jianxiao ¹ ;

作者机构： 1.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Herbage Improvement & Grassland Agro, Natl Field Sci Observat & Res Stn Grassland Agroec, Lanzhou 730020, Peoples R China

2.Linyi Univ, Coll Agr & Forestry Sci, Linyi 276000, Peoples R China

3.Hawassa Univ, Wondo Genet Coll Forestry & Nat Resources, POB 128, Shashemene, Ethiopia

4.Univ Adelaide, Sch Agr Food & Wine, Urrbrae, SA 5064, Australia

5.Univ Stirling, Sch Biol & Environm Sci, Stirling FK9 4LA, Scotland

6.Changdu Anim Husb Stn, Tibet 854000, Peoples R China

7.Yunnan Acad Agr Sci YAAS, Inst Agr Environm & Resources, Kunming, Peoples R China

8.Univ Melbourne, Fac Sci, Sch Agr & Food, Melbourne, Vic, Australia

9.Chinese Acad Forestry, Inst Desertificat Studies, Inst Ecol Conservat & Restorat, Beijing 100091, Peoples R China

10.SCION, Private Bag 29237, Rotorua 8440, New Zealand

11.Guizhou Educ Univ, Sch Geog & Resources, Guizhou Prov Key Lab Geog State Monitoring Watersh, Guiyang 550018, Peoples R China

12.Nat Resources Inst Finland, Prod Syst Unit, Grasslands & Sustainable Farming, Halolantie 31A, FI-71750 Kuopio, Finland

关键词： Cropland to grassland conversion; Soil stoichiometry; Microbial C -N-P stoichiometry; Enzyme C-N-P stoichiometry

期刊名称：CATENA （ 影响因子：5.7； 五年影响因子：6.3 ）

ISSN： 0341-8162

年卷期： 2024 年 246 卷

页码：

收录情况： SCI

摘要： In response to escalating land degradation, the conversion of cropland to grassland has emerged as a crucial mitigation strategy. This conversion has a significant influence on the stoichiometry of soil, microorganisms, and enzymes, specifically in relation to carbon (C), nitrogen (N), and phosphorus (P). A meta-analysis was conducted with 371 observations from 122 articles investigating the impacts of cropland to grassland conversion on the CN-P stoichiometric dynamics of soils, microorganisms, and enzymes across China. The findings revealed that conversion significantly increased soil C:P (9.0%), soil N:P (5.6%), microbial C:N (15.5%), and notably, microbial C:P by 57.9%. This substantial increase in microbial C:P indicates that microbial communities are highly responsive to land use conversion. Contrastingly, the enzyme C:P ratio decreased by 19.8%, suggesting microbial adaptation to changing nutrient availability. The duration of conversion was positively correlated with soil C:P and N:P ratios, implying that relative P availability may decrease as conversion progresses. However, duration was negatively correlated with microbial C:P. Environmental factors such as clay content, mean annual temperature, and mean annual precipitation were positively correlated with microbial C:N and negatively correlated with microbial N:P, while soil pH was inversely correlated with microbial C:N. These results suggest the substantial influence of cropland to grassland conversion on soil, microbial, and enzyme stoichiometry, with particularly pronounced effects on microbial communities. The observed shifts in stoichiometric ratios suggest changes in nutrient cycling and availability following conversion. While these changes are primarily attributed to the land use conversion, we acknowledge that alterations in management practices, such as reduced fertilization, likely contribute to the observed stoichiometric shifts. Our findings emphasize the importance of considering both environmental factors and management practices when implementing grassland conversion initiatives.