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通过对黄土高原水蚀风蚀交错区4种相邻植被条带(撂荒地、柠条地、苜蓿地、农地)0~4m土壤剖面含水量和地上生物特征的测定分析,研究不同植被之间的水分竞争关系。结果表明:水平方向上,撂荒地和农地土壤含水量随着靠近柠条地和苜蓿地呈下降趋势,且柠条对临近撂荒地土壤水分影响的水平距离至少有6 m。而深根性植物柠条和苜蓿相邻处测点的土壤含水量在所有测点中最低。此外,通过对地上生物特征分析,临近农地的苜蓿和临近撂荒地的柠条有较高的生物指标,证明这两种深根系植物吸收利用了相邻地块的土壤水分。因此,柠条和苜蓿对土壤水分竞争激烈,不宜搭配种植,而深根-浅根植物搭配扩大了深根系植物根系吸水空间,有利于其生长。
Through the analysis and determination of the water content and aboveground biomass of 0-4 m soil profile in four adjacent vegetation strips (abandoned land, kadai strip, alfalfa land and agricultural land) in the wind-water erosion crisscross region on the Loess Plateau, Water competition. The results showed that in the horizontal direction, the soil moisture of deserted land and agricultural land tended to decrease with the approaching of Caragana korshinskii and alfalfa land, and the horizontal distance of Caragana korshinskii to the soil moisture of adjacent abandoned land was at least 6 m. However, the soil moisture content of the measuring points adjacent to deep rooted plants Caragana korshinskii and alfalfa was the lowest among all the test sites. In addition, through the analysis of above-ground biological characteristics, the alfalfa near the farmland and the Caragana korshinskii in the adjacent wasteland have higher biological indexes, which prove that the two deep-rooted plants absorb and utilize the soil moisture of the adjacent plots. Therefore, Caragana korshinskii and alfalfa are highly competitive with soil moisture and should not be used for planting. Deep roots and shallow roots collocated with the roots to increase the water absorption capacity of root system plants, which is good for their growth.