喀斯特区土壤水分动态模拟及实地造林的研究

通过对贵州花江喀斯特典型峡谷区土壤水分动态变化的模拟实验及野外实地造林的对比研究，了解喀斯特地区水分变化规律及保墒技术。结果表明：在控制实验条件下，土壤水分的消耗除了与覆盖物及覆盖程度有关外，还与有无植物有关，且以完全覆盖最好；薄膜覆盖保水效果优于石块覆盖，枯枝落叶覆盖的保水效果较差。但实地人工造林试验结果证明，覆盖程度需达植苗穴的60％以上；石面覆盖存活率最高，其次是枯枝落叶覆盖。尽管薄膜覆盖保水效果最好，但存活率最差，因而薄膜覆盖在喀斯特典型峡谷区植苗造林值得选一步研究。图6表2参11

Soil moisture dynamics with mold and mulching during afforestation in a karst region

To understand variations in soil moisture dynamics with afforestation of karst regions, simulation experiments in the intelligent climate-control chamber （RXZ） and in the fields were conducted in typical karst formations of the Huajiang Valley, the southwestern Guizhou Province. We used three types of much, including litter, stone and plastic film, with 0, 30% , 60% and 100% coverage, and conducted having seedlings （one-year-old pepper） and no seedlings. Results showed that soil moisture use was related to mulch type, mulch quantity, and whether having plants with continuous mulching best. To reduce mold due to moisture, plastic mulch excelled stone mulch with litter mulch being worse. However, results with afforestation showed that at least 60% mulch should be applied. The plant survival rate with stone mulching was higher than with litter which was much higher than plastic mulch. Even though plastic mulch had the lowest moisture for mold, plant survival rates with the plastic mulch were poor. So, in a typical karst valley area, afforestation under plastic mulching should be studied further. [ Ch, 6 fig. 2 tab. 11 ref. ]