摘要
土壤水稳性团聚体是反映土壤质量好坏与土壤抗侵蚀能力的重要指标.通过野外调查与室内分析,研究太行山南麓不同恢复年限(33、45和49 a)油松人工林土壤水稳性团聚体的稳定性状况及其影响因素.结果表明:不同恢复年限油松人工林土壤水稳性团聚体均以大团聚体(>0.25 mm)为主,大团聚体含量在80%以上,但恢复49 a油松人工林土壤水稳性大团聚体含量在0~50 cm各土层中均低于恢复33 a油松人工林,且在10~40 cm土层差异显著.随着油松人工林的逐步恢复,>2 mm粒级的土壤水稳性团聚体含量下降,土壤水稳性团聚体分形维数(D)、破坏率(PAD)波动增加,平均质量直径(MWD)和几何平均直径(GMD)在0~40 cm深度范围内明显减小,2 mm粒级的土壤水稳性团聚体可以作为油松人工林土壤水稳性团聚体稳定性的重要度量阈值.土壤黏粒会促使小粒级土壤水稳性团聚体的形成,而有机质、速效磷、速效钾、砂粒等能够促进小粒级土壤水稳性团聚体向大粒级转化,从而提高土壤水稳性团聚体稳定性.研究显示,油松人工林恢复过程中土壤团聚状态良好、稳定性强、分散性弱,但恢复到一定阶段会引起土壤水稳性团聚体稳定性降低,这与土壤有机质、速效磷、速效钾以及机械组成变化等有直接关系.
Water-stable aggregates are important indicators reflecting soil quality and soil erosion resistance.Based on the field survey and laboratory analysis,the stability status and its influencing factors of soil water-stable aggregate of Pinus tabulaeformis plantation with different restoration age in Taihang Mountain were investigated by comprehensively using mean weight diameter(MWD),geometrical mean diameter(GMD),fractal dimensions(D)and percentage of aggregate destruction(PAD)methods.The results showed that soil water-stable aggregates of P.tabulaeformis with different restoration stage were dominated by particles with sizes>0.25 mm,accounting for more than 80%the soil.However,the percentage of>0.25 mm soil water-stable aggregates of 49 a P.tabulaeformis was obviously lower than that of 33 a P.tabulaeformis,especially in 10-40 cm of soil layers(P<0.05).With P.tabulaeformis restoration,PAD and D of soil water-stable aggregate were fluctuating upward,but MWD and GMD significantly decreased in 0-40 cm of soil layers.Particles with 2 mm size could be regarded as the critical threshold for the water stability of soil water-stable aggregate.Increasing soil clay was beneficial to the formation of smaller water-stable aggregates,while soil organic matter,available phosphorus,available potassium,and soil sand could promote the smaller aggregates turn to the larger,thereby improving the stability of soil water-stable aggregates.The finding indicated that soil agglomeration state was good,with strong stability and weak dispersion during the restoration process of P.tabulaeformis.However,at a certain stage,the stability of soil water-stable aggregates decreased,which was directly related to the changes in soil organic matter,available phosphorus,available potassium,and mechanical composition.
作者
郭灵辉
张文旭
高江波
郝成元
张博
李琛
GUO Linghui;ZHANG Wenxu;GAO Jiangbo;HAO Chengyuan;ZHANG Bo;LI Chen(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Chengdu Institute of Mountain Hazards and Environment,Ministry of Water Resources,Chinese Academy of Sciences,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;Key Laboratory of Land Surface Pattern and Simulation,Chinese Academy of Sciences,Beijing 100101,China)
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2019年第11期1861-1868,共8页
Research of Environmental Sciences
基金
国家自然科学基金项目(No.41601580,41671098)
河南理工大学博士基金(No.B2015-17)~~
关键词
油松人工林
水稳性团聚体
稳定性
影响因素
Pinus tabulaeformis plantation
water stable aggregate
stability
influence forces
