论文部分内容阅读
在江西省鹰潭农田生态系统国家野外科学观测研究站(28°04′～28°37′N,116°41′～117°09′E)外,随机选取了第四纪红黏土、第三纪红砂岩和花岗岩发育的林地、灌丛、旱地和稻田共12个类型组合的红壤,采用干-湿筛法,对不同成土母质与利用方式下的红壤进行了团聚体粒径组成与稳定性的研究,结果表明:12个类型组合的红壤中,除花岗岩发育的灌丛红壤外,土壤机械稳定性团聚体的粒径组成大小顺序均为(>2 mm)>2～0.25 mm>0.25～0.053 mm>(<0.0.53 mm);浸水湿筛后,>2 mm的水稳定性团聚体所占比例显著降低,2～0.25 mm、0.25～0.053 mm和<0.053 mm的粒径数量增加显著。土壤机械稳定性团聚体的平均重量直径(MWDd)与红壤结构破坏率(PAD)呈显著正相关关系,可以用来表征红壤结构稳定性的大小,MWDd与水稳定性团聚体的平均重量直径(MWDw)之差(△MWD)与PAD呈显著负相关关系,即△MWD值越大,红壤的稳定性就越差。不同成土母质与利用方式影响下红壤团聚结构组成与稳定性变化差异显著,因此,在红壤资源开发利用过程中要综合考虑二者的交互作用,以提高红壤资源利用的实效性与高效性。
The Quaternary red clay, Tertiary periodontal beds were selected randomly from the National Field Observation Station (28 ° 04’-28 ° 37’N, 116 ° 41’-117 ° 09’E) of Yingtan Farmland Ecosystem in Jiangxi Province. Red soil with combination of red sandstone, granite and woodland, shrubland, dry land and paddy field. The composition and stability of aggregates in different soil parent materials and utilization ways were studied by dry-wet sieving method. The results showed that the order of particle size distribution of soil mechanical stability aggregates was (> 2 mm)> 2 ~ 0.25 mm> 0.25 ~ 2.0 mm in all 12 types of red soils. 0.053 mm> (<0.0.53 mm). The proportion of water-stable aggregates> 2 mm significantly decreased after soaking wet sieves, and the number of particle sizes of 2 ~ 0.25 mm, 0.25 ~ 0.053 mm and <0.053 mm increased significantly . The average weight diameter (MWDd) of soil mechanical stability aggregates was positively correlated with soil structure failure rate (PAD), which could be used to characterize the structure stability of red soil, the average weight diameter of MWDd and water-stable aggregates MWDw) (△ MWD) showed a significant negative correlation with PAD, that is, the greater the △ MWD value, the worse the stability of red soil. Under the influence of different parent materials and utilization methods, the composition and stability of agglomeration structure of red soils differed significantly. Therefore, the interaction between them should be comprehensively considered in the process of exploitation and utilization of red soils in order to improve the efficiency and efficiency of red soil resources utilization.