科尔沁沙地南缘不同植被对土壤物理性质改良作用研究

发布时间：2018-05-25 22:19

本文选题：科尔沁沙地 + 植被　；参考：《水土保持研究》2017年02期

【摘要】：试验选取科尔沁沙地南缘樟子松林地、柠条林地、狗尾草草地、裸沙地(对照)4种典型立地类型为研究对象,通过测定各研究地土壤容重、土壤含水率、最大持水量、毛管持水量、田间持水量及沙粒粒径等物理指标,研究分析不同植被对沙地土壤物理性质的改良作用。研究表明:3种植被都对土壤物理性质都有一定改良作用。(1)柠条和樟子松对沙地土的保水效果较差,1m深处的土壤含水率仅为2.1%和2.6%,低于裸沙地,而狗尾草草地1m深处的含水率达到7.4%,为裸沙地1m深处的1.6倍。(2)通过分析0—30cm各物理指标平均值,得出3种植被下,土壤容重都小于裸沙地;狗尾草草地毛管持水量和田间持水量都最高,分别为21.7%和18.2%。其次为柠条林地和樟子松林地,裸沙地最小;柠条林地最大持水量最高,为24.6%,其次为狗尾草草地和樟子松林地,裸沙地最小。(3)通过对不同土层深度物理指标分析得出:3种植被对0—10cm和10—20cm的土壤容重、最大持水量、田间持水量有显著影响,而对毛管持水量没有显著影响;对20—30cm的土壤各指标都有显著的影响。(4)三种植被对土壤颗粒分布异质性改良效果的大小顺序依次为狗尾草樟子松柠条,其间接反映了土壤粒径分布范围的均匀程度,其由高到低依次为狗尾草樟子松柠条。综上,与裸沙地相比,种植各植被土壤的物理指标明显好于裸沙地,表明植被能明显改善当地土壤的物理性质。
[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.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家农业综合开发东北黑土区水土流失重点治理科技推广项目“面源污染防治技术体系在水土保持当中的应用”
【分类号】：S156

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