本文關(guān)鍵詞： 遼河干流中下游流域 土地利用方式 土壤大團(tuán)聚體 水穩(wěn)定性 空間分布　出處：《草業(yè)科學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：土壤大團(tuán)聚體含量能表征土壤結(jié)構(gòu)穩(wěn)定性,反映土壤結(jié)構(gòu)變化趨勢(shì)。本研究在遼河干流中下游流域主要沙化區(qū)分析濕地、林地、農(nóng)田和草地4種土地利用方式對(duì)0-20cm土層土壤大團(tuán)聚體(0.25 mm)含量和穩(wěn)定性的影響,及各粒徑大團(tuán)聚體的空間異質(zhì)性,并進(jìn)行空間插值模擬其分布。結(jié)果顯示,農(nóng)田土壤團(tuán)聚體破壞率最大,達(dá)到46.98%,林地最小,為26.36%;依據(jù)土壤水穩(wěn)性大團(tuán)聚體含量、團(tuán)聚體顆粒平均重量直徑和幾何平均直徑,評(píng)價(jià)土壤結(jié)構(gòu)穩(wěn)定性強(qiáng)弱為濕地林地農(nóng)田草地;4種土地利用導(dǎo)致土壤大團(tuán)聚體穩(wěn)定性差異顯著(P0.05),濕地和草地之間的差異性最顯著;濕地土壤結(jié)構(gòu)相對(duì)最好,其次是林地和農(nóng)田,草地相對(duì)最差。本研究結(jié)果可為遼河干流流域土地沙化程度評(píng)價(jià)及分區(qū)治理提供參考依據(jù)。
[Abstract]:The content of soil macroaggregates can represent the stability of soil structure and reflect the changing trend of soil structure. In this study, wetland and woodland were analyzed in the main sandy areas of the middle and lower reaches of Liaohe River. The effects of farmland and grassland land use patterns on the content and stability of large aggregates in 0-20cm soil layer and the spatial heterogeneity of large aggregates were studied. The distribution was simulated by spatial interpolation. The damage rate of soil aggregate in farmland was the highest, reaching 46.98, and that in woodland was the smallest, which was 26.36.The average weight diameter and geometric average diameter of aggregate particles were obtained according to the content of soil water stable aggregates. To evaluate the stability of soil structure, four kinds of land use in wetland woodland, farmland, grassland and grassland resulted in significant difference in the stability of soil aggregate, the difference between wetland and grassland was most significant, and the structure of wetland soil was the best, followed by woodland and farmland. The results of this study can provide a reference for the evaluation of land desertification degree and zoning management in Liaohe River main river basin.
【作者單位】： 沈陽(yáng)農(nóng)業(yè)大學(xué)水利學(xué)院;遼寧雙臺(tái)河口濕地生態(tài)國(guó)家定位觀測(cè)研究站;
【基金】：國(guó)家自然基金面上項(xiàng)目(31470710);國(guó)家自然基金面上項(xiàng)目(31570706)
【分類號(hào)】：S152.4

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