文献类型：期刊文献

英文题名：Differential Responses of Soil Nitrogen Forms to Climate Warming in Castanopsis hystrix and Quercus aliena Forests of China

作者：Shu, Weiwei[1,2] Wang, Hui[3] Liu, Shirong[3] Liu, Yanchun[4] Min, Huilin[1] Li, Zhaoying[1] Dell, Bernard[5,6] Chen, Lin[1]

第一作者：舒韦维;Shu, Weiwei

通信作者：Chen, L[1];Dell, B[2];Dell, B[3]

机构：[1]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Peoples R China;[2]Youyiguan Forest Ecosyst Observat & Res Stn Guangx, Guangxi Youyiguan Forest Ecosyst Res Stn, Pingxiang 532600, Peoples R China;[3]Chinese Acad Forestry, Ecol & Nat Conservat Inst, Key Lab Forest Ecol & Environm, Natl Forestry & Grassland Adm, 2 Dongxiaofu, Beijing 100091, Peoples R China;[4]Henan Univ, Sch Life Sci, Int Joint Res Lab Global Change, Kaifeng 475004, Peoples R China;[5]Murdoch Univ, Agr & Forest Sci, Murdoch, WA 6150, Australia;[6]Chinese Acad Forestry, Ecol & Nat Conservat Inst, Beijing 100091, Peoples R China

年份：2024

卷号：15

期号：9

外文期刊名：FORESTS

收录：;EI(收录号：20243917118147);Scopus(收录号：2-s2.0-85204934975);WOS:【SCI-EXPANDED(收录号:WOS:001326198100001)】；

基金：This research was funded by the Chinese Academy of Forestry, CAFYBB2020ZA001, and National Key Research and Development Program of China, 2023YFE0105100-1.

语种：英文

外文关键词：experimental warming; fine roots; soil microorganisms; soil nitrogen mineralization

摘要：Climate warming impacts soil nitrogen cycling in forest ecosystems, thus influencing their productivity, but this has not yet been sufficiently studied. Experiments commenced in January 2012 in a subtropical Castanopsis hystrix Hook. f. and Thomson ex A. DC. plantation and in May 2011 in a temperate Quercus aliena Blume forest, China. Four treatments were established comprising trenching, artificial warming (up to 2 degrees C), artificial warming + trenching, and untreated control plots. The plots were 2 x 3 m in size. In 2021 and 2022, soil nitrogen mineralization, soil nutrient availability, fine root biomass and microbial biomass were measured at 0-20 cm soil depth in 6 replicate plots per treatment. Warming significantly increased soil temperature in both forests. In the C. hystrix plantation, warming significantly increased available phosphorus (AP) and fine root biomass (FRB), but it did not affect soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), microbial biomass phosphorus (MBP) and their ratios. Warming depressed the net mineralization rate (NMR) and net ammonification rate (NAR) of the C. hystrix plantation, probably because the competition for nitrogen uptake by fine roots and microorganisms increased, thus decreasing substrates for nitrogen mineralization and ammonification processes. Trenching and warming + trenching increased the net nitrification rate (NNR), which might be related to decreased NH4+-N absorption of trees in the trenched plots and the increased microbial activity involved in soil nitrification. In the Q. aliena forest, warming significantly increased NH4+-N, MBC/MBN, Root C/N, Root N/P, and decreased pH, MBN, MBN/MBP and Root P; and there was no effect of trenching. Notably, the NAR, NNR and NMR were largely unaffected by long-term warming. We attributed this to the negative effect of increasing NH4+-N and decreasing MBN/MBP offsetting the positive effect of soil warming. This study highlights the vulnerability of subtropical forest stands to long-term warming due to decreased soil N mineralization and increased NO3--N leaching. In contrast, the soil N cycle in the temperate forest was more resilient to a decade of continuous warming.