N and P fertilization reduced soil autotrophic and heterotrophic respiration in a young Cunninghamia lanceolata forest
N and P fertilization reduced soil autotrophic and heterotrophic respiration in a young Cunninghamia lanceolata forest
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氮肥和磷肥减少了杉木幼林土壤的自养和异养呼吸
DOI：
10.1016/j.agrformet.2016.08.007
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发表时间：
2017-01
影响因子：
6.2
通讯作者：
Xiao Fuming
中科院分区：
文献类型：
--
作者：
Wang Qingkui;Zhang Weidong;Sun Tao;Chen Longchi;Pang Xueyong;Wang Yanping;Xiao Fuming
了解土壤呼吸(Rs)中异养(Rh)和自养(Ra)组分对施肥的响应对于评价人工林生态系统管理措施对土壤碳循环的影响具有重要意义。为此，我们在亚热带中国的杉木幼林施氮、磷肥条件下，用开沟法研究了Ra和Rh。于2013年12月至2015年11月对土壤CO2排放进行了测定。施肥后，年平均Rs、Ra和Rh分别下降18.6%、23.6%和17.1%。Rh对Rs的贡献率为70.9%~76.7%。这一贡献在施磷区较大，说明施肥改变了Rh和Ra对Rs的贡献。受精引起的Rh减少率平均占Rs减少率的66.9%。土壤温度和水分对Rh的贡献率分别为51.2%~69.3%和53.6%~66.7%。而Rs和Rh的温度敏感性不受施肥的影响。Ra和Rh与细根生物量呈正相关。相对湿度与土壤有机碳、溶解有机碳、微生物量碳呈正相关，与土壤矿质氮含量呈负相关。我们的结果强调了施肥对土壤CO2排放的重要性及其对估算森林碳汇潜力的意义。
Understanding the response of heterotrophic (Rh) and autotrophic (Ra) components of soil respiration (Rs) to fertilization is important to evaluate the effects of management practices on soil carbon cycling in plantation forest ecosystems. Therefore, we investigated Ra and Rh using a trenching method in a youngCunninghamia lanceolataplantation, subjected to N and P fertilization in subtropical China. Soil CO2efflux was measured from December 2013 to November 2015. Mean annual Rs, Ra, and Rh rates decreased on average by 18.6%, 23.6%, and 17.1% after fertilization. The contribution of Rh to Rs ranged from 70.9% to 76.7%. This contribution was greater in P-fertilized plots, suggesting that fertilization changed the contribution of Rh and Ra to Rs. The reduced rate of Rh induced by fertilization contributed on average 66.9% to the decrease in Rs rate. This contribution for Rh was higher in NP-fertilized plots than in other plots Based on a bivariate model, 51.2%–69.3% and 53.6%–66.7% of the variations in Rs and Rh among different treatments were explained by soil temperature and moisture. However, temperature sensitivity of Rs and Rh were not affected by fertilization. Ra and Rh were positively related to fine root biomass. Rh was also positively related to soil organic C, dissolved organic C, and microbial biomass C, but negatively related to soil mineral N content. Our results highlight the importance of fertilization on soil CO2efflux and its significance to the estimation of forest C sink potential.
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影响因子：
11.6
作者：
Hasselquist, Niles J.;Metcalfe, Daniel B.;Hogberg, Peter
通讯作者：
Hogberg, Peter
影响因子：
4.8
作者：
Hill, GT;Mitkowski, NA;Nelson, EB
通讯作者：
Nelson, EB
DOI：
10.1111/j.1469-8137.2007.02204.x
发表时间：
2007-11
期刊：
The New phytologist
影响因子：
--
作者：
Richard P Phillips;T. Fahey
通讯作者：
Richard P Phillips;T. Fahey
影响因子：
64.8
作者：
Högberg, P;Nordgren, A;Read, DJ
通讯作者：
Read, DJ
施氮对中国落叶松和水曲柳人工林土壤呼吸、微生物量和根系呼吸的影响
影响因子：
4.9
作者：
Jia, Shuxia;Wang, Zhengquan;Liang, Aizhen
通讯作者：
Liang, Aizhen