文献类型：期刊文献

中文题名：马尾松人工林土壤和团聚体有机碳矿化对穿透雨减少的响应

英文题名：Responses of soil and aggregate-associated organic carbon mineralization to throughfall reduction in a Pinus massoniana plantation

作者：杨予静[1] 刘世荣[1] 陈琳[2,3] 王晖[1]

第一作者：杨予静

机构：[1]中国林业科学研究院森林生态环境与保护研究所,国家林业局森林生态环境重点实验室,北京100091;[2]中国林业科学研究院热带林业实验中心,广西凭祥532600;[3]广西友谊关森林生态系统定位观测研究站,广西凭祥532600

年份：2018

卷号：29

期号：6

起止页码：1779-1786

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；PubMed;

基金：国家科技部国际科技合作专项(2015DFA31440); 国家林业公益性行业科研专项(201404201)资助

语种：中文

中文关键词：降雨减少;土壤碳矿化;土壤团聚体

外文关键词：precipitation reduction;soil carbon mineralization;soil aggregate.

分类号：S152.4

摘要：为研究气候变化背景下降水格局对森林土壤碳排放机制的影响,在南亚热带马尾松人工林中模拟穿透雨减少50%,采用室内恒温培养法研究减水处理对土壤和不同粒级团聚体有机碳矿化的影响.结果表明:1~2 mm团聚体有机碳累积矿化量高于其他粒级团聚体.干湿季减雨样地表层土壤含水量分别是对照样地的82.1%和82.7%,而其0.106~0.25 mm土壤团聚体质量分数分别比对照增加1.8%和4.2%.与对照相比,穿透雨减少显著降低了干季土壤和微团聚体易矿化碳库的矿化速率(k_1),增加了土壤和<1 mm团聚体难分解碳库的分解速率(k_2),但对土壤有机碳累积矿化量无显著影响.相关分析表明,土壤和微团聚体k_1呈显著正相关,土壤和0.25~1 mm团聚体k_2呈显著正相关.受团聚体结构、水分条件和土壤有机碳含量的影响,穿透雨减少对干季土壤易矿化和难分解有机碳的矿化分别起抑制和促进作用.
To examine the effects of altered precipitation pattern on the mechanism of forest soil carbon（ C） emission under climate change scenarios,we established plots with 50% reduction in throughfall in a subtropical Pinus massoniana plantation. The effects of throughfall reduction on the mineralization of both soil and aggregate-associated organic C were quantified by laboratory incubation at constant temperature. The results showed that the cumulative mineralization of organic C in the 1-2 mm aggregates was higher than that in other sizes of aggregates. In the dry and wet seasons,the surface soil water content in the throughfall reduction plots was 82.1% and 82.7% of that in the control,but the mass fractions of 0.106-0.25 mm soil aggregates in the throughfall reduction plots increased by 1.8% and 4.2% than the control,respectively. The throughfall reduction treatment significantly reduced the mineralization rate of labile C pools（ k1） of soil and micro-aggregates in the dry season,increased the mineralization rate of recalcitrant C pool（ k2） of soil and 1 mm aggregates,and had no significant effects on the cumulative mineralization of soil organic C. Results from the correlation analyses revealed significant and positive correlations between k1 of soil and that of the micro-aggregates and between k2 of soil and that of the 0.25-1 mm aggregates. Under the influence of aggregate structure,water condition and soil organic carbon content,the throughfall reduction suppressed the mineralization of labile organic C while stimulated that of recalcitrant organic C.