本文選題：科爾沁沙地 + 植被��； 參考：《水土保持研究》2017年02期

【摘要】：試驗選取科爾沁沙地南緣樟子松林地、檸條林地、狗尾草草地、裸沙地(對照)4種典型立地類型為研究對象,通過測定各研究地土壤容重、土壤含水率、最大持水量、毛管持水量、田間持水量及沙粒粒徑等物理指標(biāo),研究分析不同植被對沙地土壤物理性質(zhì)的改良作用。研究表明:3種植被都對土壤物理性質(zhì)都有一定改良作用。(1)檸條和樟子松對沙地土的保水效果較差,1m深處的土壤含水率僅為2.1%和2.6%,低于裸沙地,而狗尾草草地1m深處的含水率達到7.4%,為裸沙地1m深處的1.6倍。(2)通過分析0—30cm各物理指標(biāo)平均值,得出3種植被下,土壤容重都小于裸沙地;狗尾草草地毛管持水量和田間持水量都最高,分別為21.7%和18.2%。其次為檸條林地和樟子松林地,裸沙地最小;檸條林地最大持水量最高,為24.6%,其次為狗尾草草地和樟子松林地,裸沙地最小。(3)通過對不同土層深度物理指標(biāo)分析得出:3種植被對0—10cm和10—20cm的土壤容重、最大持水量、田間持水量有顯著影響,而對毛管持水量沒有顯著影響;對20—30cm的土壤各指標(biāo)都有顯著的影響。(4)三種植被對土壤顆粒分布異質(zhì)性改良效果的大小順序依次為狗尾草樟子松檸條,其間接反映了土壤粒徑分布范圍的均勻程度,其由高到低依次為狗尾草樟子松檸條。綜上,與裸沙地相比,種植各植被土壤的物理指標(biāo)明顯好于裸沙地,表明植被能明顯改善當(dāng)?shù)赝寥赖奈锢硇再|(zhì)。
[Abstract]:Four typical site types, including Pinus sylvestris forest, Caragana korshinskii forest land, grass and bare sandy land, were selected in the experiment. The soil bulk density, soil moisture content and maximum water holding capacity were measured by measuring soil bulk density, soil moisture content and maximum water holding capacity. The physical indexes of capillary water holding capacity field water holding capacity and sand particle size were studied and analyzed to improve the physical properties of sandy soil by different vegetation. The results showed that the soil moisture content of Caragana korshinskii and Pinus sylvestris var. korshinskii was lower than that of bare sandy land. On the other hand, the moisture content of grass in 1m depth was 7.4m, which was 1.6 times as high as that in bare sandy land. By analyzing the average physical indexes of 0-30cm, the results showed that the bulk density of soil was smaller than that of bare sandy land under three planting quilts. The capillary water holding capacity and field water holding capacity were the highest, 21.7% and 18.2%, respectively. Caragana woodland and Pinus sylvestris forest land, bare sandy land is the smallest, Caragana woodland has the highest maximum water holding capacity (24.6B), followed by the grass grassland and Pinus sylvestris forest land, Through the analysis of physical indexes of different soil depth, the results showed that the soil bulk density, maximum water holding capacity and field water holding capacity of 0-10cm and 10-20cm were significantly affected by the planting of 1: 3, but had no significant effect on capillary water holding capacity. The effect of three vegetation on soil particle distribution heterogeneity was in the order of Caragana korshinskii, which indirectly reflected the uniformity of soil particle size distribution. The order from high to low is Caragana korshinskii, Pinus sylvestris var. mongolica. In a word, compared with bare sandy land, the physical index of planting vegetation soil is obviously better than that of bare sandy land, which indicates that vegetation can obviously improve the physical properties of local soil.
【作者單位】： 沈陽農(nóng)業(yè)大學(xué)水利學(xué)院;
【基金】：國家農(nóng)業(yè)綜合開發(fā)東北黑土區(qū)水土流失重點治理科技推廣項目“面源污染防治技術(shù)體系在水土保持當(dāng)中的應(yīng)用”
【分類號】：S156

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本文編號：1934851