文献类型：期刊文献

英文题名：Grazing Impacts on Soil Enzyme Activities Vary with Vegetation Types in the Forest-Steppe Ecotone of Northeastern China

作者：Wang, Long[1,2] Jia, Zhiqing[1,2] Li, Qingxue[2,3] He, Lingxianzi[2,3] Tian, Jiapeng[4] Ding, Wei[4] Liu, Tao[1] Gao, Ya[1,2,5] Zhang, Jiapeng[1,2] Han, Dong[1,2] Tian, Hui[1,2]

第一作者：Wang, Long

通信作者：Jia, ZQ[1];Jia, ZQ[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[2]Qinghai Gonghe Desert Ecosyst & Res Stn, Gonghe 813005, Peoples R China;[3]Chinese Acad Forestry, Inst Ecol Protect & Restorat, Beijing 100091, Peoples R China;[4]Inner Mongolia Baiyin Obo Forest Farm, Chifeng 025369, Peoples R China;[5]Qinghai Univ Sci & Technol, Qinghai Prov Key Lab Plateau Climate Change & Corr, Xining 810016, Peoples R China

年份：2023

卷号：14

期号：12

外文期刊名：FORESTS

收录：;Scopus(收录号：2-s2.0-85180617302);WOS:【SCI-EXPANDED(收录号:WOS:001132111400001)】；

基金：We would like to acknowledge the support and cooperation of all the staff members of Baiyin Obo Forest Farm during the field investigation. We also acknowledge Allwegene Tech. for providing technical services in the determination of soil enzyme activities and microbial biomass.

语种：英文

外文关键词：grazing effects; catalase; urease; cellulase; microbial biomass

摘要：Grazing impacts soil enzyme activities by changing soil conditions and microbial functions. Yet, the specific effects of grazing on soil enzymes in different northeastern China forest-steppe vegetation types remain poorly understood. To examine this, catalase (CA), urease (UA), and cellulase (CEA) activities were measured in different vegetation types (NS, MF, CP, GL) under both grazing and non-grazing conditions. Soil microbial biomass carbon and nitrogen (MBC and MBN) and other soil factors were also studied to gauge their impact on enzyme activities. The results indicated that enzyme activities were influenced by grazing, soil nutrient levels, mineralization, and microbial biomass carbon and nitrogen content. Grazing exerted the most significant influence on UA. CEA was predominantly affected by the content of biomass nitrogen and soil mineralization. CA, on the other hand, was primarily influenced by soil nutrient levels. Grazing influenced enzyme activities differently based on vegetation type. Under grazing, CA showed higher values in NS, MF, CP, and GL (4.09, 2.42, 3.26, and 3.90 mL 0.1 mol L-1 KMnO4 g(-1) soil 20 min(-1), respectively) with increases ranging from 32.52% to 505.00% (p < 0.05). Additionally, UA values were significantly higher in MF and CP (0.24 and 0.59 mg NH4+-N g(-1) soil d(-1), respectively) with increases of 66.67% and 156.00%, while UA and CEA were lower in GL, showing reductions of 78.79% and 166.67% (p < 0.05) (0.33 NH4+-N g(-1) soil d(-1) and 0.06 mg glucose g(-1) soil 72 h(-1), respectively) under grazing conditions. These findings underscore the importance of vegetation types in the grazing effects on soil enzymes at the forest-steppe ecotone and suggest that further efforts should be made to strengthen grassland grazing management to mitigate negative impacts on soil environmental health.