黄土高原土壤团聚体稳定性及抗蚀性能力经度变化特征

分析与探讨了黄土高原地区的土壤理化性质和土壤团聚体稳定性随经度的变化特征,为其植被恢复及利用提供有力的理论支持和依据。采用常规的化学分析方法测定土壤的理化性质,并用干筛与湿筛法结合测定土壤各级团粒含量。结果表明,随着经度的升高,黄土高原地区的土壤有机碳和全氮含量都呈增加趋势,其中定西的含量都是最低的,该地植物以灌木(柠条)为主;全磷含量变化不明显。通过计算土壤团聚体的平均重量直径(MWD值)和土壤可蚀性值(K值),除了定西地区的MWD值最小、K值最大外,其余地区的MWD值、K值分别在2.00、0.19左右,都是随着经度升高波动范围较小。说明黄土高原地区乔木林比灌木林的土壤有机碳和全氮含量高,土壤团聚体稳定性好、抗侵蚀性能强。

Characteristics of soil aggregate stability and corrosion resistance longitude change in the Loess Plateau

In this study, we investigated variation of soil chemical properties and soil aggregation stability along with longitudes on the Chinese Loess Plateau (CLP). It can provide soundly theoretical support and reference for vegetation restoration on the CLP. By using conventional chemical analysis method, we measured soil physiochemical properties. In addition, we used a combined method of dry and wet sieving to measure soil aggregates content. The results indicated that the content of soil organic carbon and total nitrogen enhanced with the increased longitude, but there was no significant difference (P < 0.05) of soil total phosphorus along with longitude on the CLP. The soil organic carbon and total nitrogen was always the lowest in Dingxi which was dominated by shrubs (caragana). Through mean weight diameter of soil aggregates (MWD) and soil erodibility values (K value), we found there was little fluctuation of the MWD (about 2.00) and K value (about 0.19) with increased longitude except Dingxi where the MWD was the lowest and K value was the highest. Based on the results, we conclude that there''s more soil organic carbon and total nitrogen in arbor forest land. The soil aggregate is more stable and the soil anti-erosion ability is better than that of the shrub forest land.