%0 Journal Article
%T CO2 and N2O emissions in the red soils of agro-forestry (grass) systems conversed from cropland in subtropical hilly region of China<br>农田改为农林(草)复合系统对红壤CO2和 N2O排放的影响
%A GUO Zhong-Lu
%A ZHENG Min-Jiao
%A DING Shu-Wen
%A LI Zhao-Xia
%A CAI Chong-Fa
%A <br>郭忠录
%A 郑珉娇
%A 丁树文
%A 李朝霞
%A 蔡崇法
%J 中国生态农业学报
%D 2012
%I 
%X Not much information exists on soil respiration and nitrous oxide emissions in soils under different terrestrial ecosystems in subtropical China. Field experiments were conducted in static chambers to investigate the effects of soil environmental conditions on CO2 and N2O fluxes from red soils under six different land use types. The investigated land use types included maize land, Amorpha fruticosa plantation, Vetiveria zizanioides plantation, A. fruticosa + maize and V. zizanioides + maize agro-forestry (grass) systems, and wasteland. Also variations in soil greenhouse gases, water, nitrogen, organic carbon, microbial biomass carbon and net nitrogen mineralization were determined. The results were as follows: 1) during maize growth season, CO2 flux in wasteland was lower than that in A. fruticosa + maize agro-forestry system, sole maize, V. zizanioides + maize agro-grass system, A. fruticosa plantation and V. zizanioides plantation, in that order. However, no significant differences in CO2 flux were noted among five land use types. 2) N2O fluxes were 508 g·hm-2·a-1, 470 g·hm-2·a-1, 390 g·hm-2·a-1, 373 g·hm-2·a-1, 372 g·hm-2·a-1 and 285 g·hm-2·a-1 for A. fruticosa + maize agro-forestry system, A. fruticosa plantation, wasteland, V. zizanioides + maize agro-grass system, V. zizanioides plantation and sole maize, respectively. 3) No significant relationships existed between CO2 fluxes and soil organic carbon, microbial biomass carbon or water content. Significant positive linear relationship was, however, observed between N2O flux and soil mineralization. The study suggested that land conversion from cropland to agro-forestry potentially increased soil CO2 and N2O release. While land conversion from cropland to forestland and/or grassland potentially decreased soil CO2 emission, it increased N2O emission.
%K Returning farmland to forest or grass
%K Agro-forestry (grass) system
%K Land use change
%K Red soil
%K CO2 and N2O emission<br>退耕还林(草)
%K 农林(草)复合系统
%K 土地利用变化
%K 红壤
%K CO2和N2O排放
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=9B3C227A81E2A28CE11D01A95037D52D&yid=99E9153A83D4CB11&vid=A04140E723CB732E&iid=9CF7A0430CBB2DFD&sid=ACF317960D6DF955&eid=D7FC8AF637611368&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=0