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Efects of sulfuric,nitric,and mixed acid rain on the decomposition of fne root litter in Southern China

Ecological Processes 2021年第1期10卷 890-902页

作者： Xin Liu Miaojing Meng Yong Zhang Chong Li Shilin Ma Qinyu Li Qiong Ren Yinlong Zhang Jinchi Zhang Co‑Innovation Center for Sustainable Forestry in Southern China Jiangsu Province Key Laboratory of Soil and Water Conservation and Ecological RestorationNanjing Forestry University159 Longpan RoadNanjing 210037JiangsuChina. Zhejiang Provincial Public Forest and State-Owned Forest Farm Management Station 226 Kaixuan RoadHangzhouZhejiangChina. Jiangxi Academy of Forestry 1629 Fenglin RoadNanchang 330032JiangxiChina. Co‑Innovation Center for Sustainable Forestry in Southern China Nan‑jing Forestry University159 Longpan RoadNanjing 210037JiangsuChina.

Background:China has been increasingly subject to signifcant acid rain,which has negative impacts on forest ***,the concentrations of NO_(3)^(−)in acid rain have increased in conjunction with the rapid rise of nitrogen deposition,which makes it difcult to precisely quantify the impacts of acid rain on forest ***:For this study,mesocosm experiments employed a random block design,comprised of ten treatments involving 120 discrete plots(0.6 m×2.0 m).The decomposition of fne roots and dynamics of nutrient loss were evaluated under the stress of three acid rain analogues(e.g.,sulfuric(SO_(4)^(2−)/NO_(3)^(−)5:1),nitric(1:5),and mixed(1:1)).Furthermore,the infuences of soil properties(e.g.,soil pH,soil total carbon,nitrogen,C/N ratio,available phosphorus,available potassium,and enzyme activity)on the decomposition of fne roots were ***:The soil pH and decomposition rate of fne root litter decreased when exposed to simulated acid rain with lower pH levels and higher NO_(3)^(−)*** activities of soil enzymes were signifcantly reduced when subjected to acid rain with higher *** activities of soil urease were more sensitive to the efects of the SO_(4)^(2−)/NO_(3)^(−)(S/N)ratio of acid rain than other soil enzyme activities over four decomposition time ***,the acid rain pH signifcantly infuenced the total carbon(TC)of fne roots during ***,the S/N ratio of acid rain had signifcant impacts on the total nitrogen(TN).In addition,the pH and S/N ratio of the acid rain had greater impacts on the metal elements(K,Ca,and Al)of fne roots than did TC,TN,and total *** equation modeling results revealed that the acid rain pH had a stronger indirect impact(0.757)on the decomposition rate of fne roots(via altered soil pH and enzyme activities)than direct ***,the indirect efects of the acid rain S/N ratio(0.265)on the fne root decomposition rate through changes in so

关键词： SO_(4)^(2−)/NO_(3)^(−)of acid rain fine root mass loss Element dynamic Soil enzyme activity Soil acidifcation

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