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

doi:10.13287/j.1001-9332.201806.006

应用生态学报 ›› 2018, Vol. 29 ›› Issue (6): 1779-1786.doi: 10.13287/j.1001-9332.201806.006

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

杨予静¹,刘世荣^1*,陈琳^2,3,王晖¹

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

收稿日期:2017-12-20 修回日期:2018-03-13 出版日期:2018-06-18 发布日期:2018-06-18
通讯作者: E-mail: liusr@caf.ac.cn
作者简介:杨予静, 女, 1988年生, 博士研究生. 主要从事森林生态学研究. E-mail: yangyujing8809@hotmail.com
基金资助:
本文由国家科技部国际科技合作专项(2015DFA31440)和国家林业公益性行业科研专项(201404201)资助

Responses of soil and aggregate-associated organic carbon mineralization to throughfall reduction in a Pinus massoniana plantation.

YANG Yu-jing¹, LIU Shi-rong^1*, CHEN Lin^2,3, WANG Hui¹

¹ State Forestry Administration Key Laboratory of Forest Ecology and Environment, Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China;
²Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;
³Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China

Received:2017-12-20 Revised:2018-03-13 Online:2018-06-18 Published:2018-06-18
Supported by:
This work was supported by the International Cooperation Program of Ministry of Science and Technology of China (2015DFA31440), and the National Forestry Public Welfare Industry Research Special Program (201404201).

摘要/Abstract

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(k₁),增加了土壤和<1 mm团聚体难分解碳库的分解速率(k₂),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k₁呈显著正相关,土壤和0.25～1 mm团聚体k₂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.

Abstract: 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.

杨予静,刘世荣,陈琳,王晖. 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[J]. 应用生态学报, 2018, 29(6): 1779-1786.

YANG Yu-jing, LIU Shi-rong, CHEN Lin, WANG Hui. Responses of soil and aggregate-associated organic carbon mineralization to throughfall reduction in a Pinus massoniana plantation.[J]. Chinese Journal of Applied Ecology, 2018, 29(6): 1779-1786.

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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

Responses of soil and aggregate-associated organic carbon mineralization to throughfall reduction in a Pinus massoniana plantation.

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