不同种植方式对红壤旱地土壤水分及抗旱能力的影响

通过3年田间小区试验,研究不同种植方式对红壤旱地土壤水分及抗旱能力的影响.结果表明：1）与种植花生相比,种植苎麻可显著提高土壤有机质质量分数（28.44％）、田间持水量（10.06％）和总孔隙度（5.65％）,土壤密度则显著降低7.20％;2）监测期内,花生地各层土壤以及整个0～ 100 cm土体水分变异系数普遍高于苎麻地,苎麻地0 ～ 100 cm土体水分的时间稳定性和空间协调性优于花生地;3）苎麻地0～ 40 cm土壤较花生地延长抗旱时间7d以上,但随着土层的加深,差异越来越小;4）红壤坡耕地种植苎麻有利于提高红壤旱地土壤抗旱能力,特别是中、上层土壤.从扩充土壤水库的角度考虑,红壤旱地种植苎麻优于种植花生,该研究结果可为挖掘红壤区深层土壤水分提供参考.

Effects of planting pattern on soil moisture and drought resistance ability in red soil

The effects of different planting patterns on soil moisture and soil drought resistance ability of red soil were studied by runoff plot experiment. The results indicated that, 1 ） compared with planting Arachis hypogaea, soil organic matter, field capacity, total porosity of the soil when planting Boehmeria sp. were increased by 28.44% , 10.06% , and 5.65% , while soil bulk density was reduced by 7.20% 2） the soil moisture variation coefficient of every soil layer and the 0 - 100 cm soil where A. hypogaea was planted was generally higher than that planted with Boehmeria in the whole monitoring period, while the temporal and spatial stability of soil moisture when planting Boehmeria sp. was better than planting A. hypogaea; 3 ） compared with planting A. hypogaea, the 0 -40 cm soil with Boehmeria sp. planted can prolong drought resistance time by more than 7 days; however, as the soil layer deepens, the difference tends to be unremarkable; 4） planting Boehmeria sp. can improve drought resistance ability of red soil, especially for the middle and upper layers. From the viewpoint of use of soil water, planting Boehmeriasp. outperforms planting A. hypogaea in red soil, which provides the basis for using deep water in red soil regions.