文章摘要
徐程, 谷峰, 王瑶, 何阳波, 陈家宙.土壤团聚体和水分动态在3种植被覆盖下的关系[J].水土保持学报,2019,33(1):68~74
土壤团聚体和水分动态在3种植被覆盖下的关系
Study on the Relationships Between Soil Aggregate and Water Dynamics Under Three Vegetation Cover
投稿时间:2018-06-28  
DOI:10.13870/j.cnki.stbcxb.2019.01.012
中文关键词: 团聚体稳定性  土壤水分  降雨  植被
英文关键词: aggregate stability  soil water  precipitation  vegetation
基金项目:国家自然科学基金项目(41601219);中央高校基本科研业务费专项(2662015BQ030)
作者单位E-mail
徐程, 谷峰, 王瑶, 何阳波, 陈家宙 华中农业大学, 农业部长江中下游耕地保育重点实验室, 武汉 430070 kathy@mail.hzau.edu.cn 
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中文摘要:
      为了探究不同植被覆盖下的土壤水分动态变化和团聚体稳定性的关系,选取桂花地、油菜地、杉树地3种植被下的土壤为研究对象,就团聚体和土壤水分之间的年变化关系、短期变化关系(在短期降雨前后)进行了研究。结果表明:在1年时间内、3种植被下的土壤中,杉树地土壤团聚体稳定性显著高于桂花地和油菜地,并以0.25~2 mm的水稳团聚体为主。土壤团聚体稳定性的年变化趋势和土壤水分呈显著负相关关系,在土壤水分含量降低的时候团聚体稳定性升高。在桂花地、油菜地中,土壤水分和<0.25 mm粒级团聚体呈显著正相关关系,和>0.25 mm粒级团聚体呈负相关趋势,表明水分会促进大团聚体破碎分解成微团聚体,从而改变团聚体稳定性。同时,在短期时间内,土壤团聚体平均重量直径(MWD)随着降雨的开始呈现下降趋势,随着降雨的停止,团聚体MWD会逐渐回升。这种变化与降雨以及降雨引起的土壤水分的迅速变化有关。综合长期和短期时间变化,种植杉树林可以有效调控土壤水分变化幅度,提高团聚体稳定性,对预防水土流失具有重要作用。
英文摘要:
      In order to explore the relationships between soil water dynamics and aggregate stability under different vegetation cover, the soil under the three vegetation types of osmanthus field, rapeseed field and fir field was selected as the research objects. The relationships between soil aggregate and soil water content in the long-term, short-term (before and after short-term rainfall) were investigated. The results showed that in the relatively long-term (one year), the aggregate stability under the fir trees field was significantly higher than those of the osmanthus and rapeseed fields. The water stable aggregate was dominated by 0.25~2 mm. The one-year aggregate variation was significantly negatively correlated with soil water content, which meant the aggregate stability increased with decreasing soil water content. For example, in osmanthus field and rapeseed field, soil water were positively correlated with the portion of aggregate (< 0.25 mm), but negatively correlated with the portion of aggregate (> 0.25 mm). This indicated that the soil water content could promote the large aggregates into microaggregates, and therefore, the stability of aggregate changed. In the short term, the soil aggregate mean weight diameter (MWD) changed in response to the soil water content.Specifically, soil aggregate MWD showed a downward trend with the beginning of rainfall, then reached a minimum value, after that, the aggregate MWD rose gradually when the rainfall stopped. The pattern of aggregate MWD was related with the rapid changes in soil water caused by rainfall and rainfall mechanical effect. Therefore, in combination with long-term and short-term changes of aggregate, fir trees in red soils can effectively regulate the dynamics of soil water variation, and improve the stability of aggregates, then play important role in preventing soil water erosion.
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