文献类型：期刊文献

英文题名：Reduction in throughfall reduces soil aggregate stability in two subtropical plantations

作者：Yang, Y. J.[1] Liu, S. R.[1] Wang, H.[1] Chen, L.[2] Lu, L. H.[2] Cai, D. X.[2]

第一作者：Yang, Y. J.

通信作者：Liu, SR[1]

机构：[1]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Chinas Natl Forestry & Grassland Adm, Key Lab Forest Ecol & Environm, Dongxiaofu 1, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Trop Forestry, Keyuan Rd 8, Pingxiang 532600, Peoples R China

年份：2019

卷号：70

期号：2

起止页码：301-310

外文期刊名：EUROPEAN JOURNAL OF SOIL SCIENCE

收录：;Scopus(收录号：2-s2.0-85056401581);WOS:【SCI-EXPANDED(收录号:WOS:000462245500009)】；

基金：We thank the Guangxi Youyiguan Forest Ecosystem Research Station for experimental stand maintenance and logistical support; and Jia Xu, Angang Ming and Zhaoying Li for assistance with field work and laboratory analysis. Special thanks to Dr Jingxin Wang at the Division of Forestry and Natural Resources, West Virginia University, for statistical analysis and language improvement on earlier drafts. We would also like to thank anonymous reviewers for their valuable suggestions, which helped us to improve our manuscript significantly. This research was supported by the Ministry of Science and Technology (2015DFA31440) and the Ministry of Finance (201404201).

语种：英文

摘要：Climate change has altered global precipitation regimes in terms of intensity and frequency of drought stress and, consequently, it is likely to affect soil moisture and soil aggregation. However, we know little about the effects of drought on soil aggregate size, distribution and stability, and how that affects carbon sequestration. A drought manipulation experiment was conducted by throughfall exclusion treatment (TET) of 50% in two planted forests (Pinus massoniana Lamb. and Castanopsis hystrix A.DC.) in subtropical China. The aim was to investigate the effects of a reduction in throughfall on aggregate size, distribution and stability. The results from the 4-year experiment show that the TET affected soil moisture content significantly (with 14.5 and 20.4% decreases in the P. massoniana and C. hystrix plantations, respectively) compared with the control. Soil temperature at 0-5-cm soil depth and soil texture were not affected significantly. Soil porosity in the TET plots was greater than that of the control, whereas soil bulk density and free Al oxide content were less. The mass fractions of macroaggregates (> 0.25 mm) and mean weight diameter (MWD) of aggregates, an indicator of aggregate stability, decreased in the TET compared with the control. Variation in aggregate size, distribution and stability can be caused by Fe and Al oxides, soil texture, bulk density and porosity. Our results indicated that TET reduced soil aggregate stability in subtropical plantations because of a decrease in free Al oxide and an increase in porosity. Slaking effects from variation in soil moisture were also possible for the decreased MWD. This study suggests disturbance of forest soils should be minimized in the context of a decline in precipitation.