摘要
通过室内与野外实验相结合研究了贵州花江喀斯特峡谷示范区不同覆盖处理下不同小生境土壤的保墒能力,试图了解喀斯特地区的土壤水分变化规律并提出相应保墒技术。结果表明:土面、石槽、石沟3种小生境通过枯枝落叶、石面、薄膜覆盖后,其土壤水分变化趋势基本一致,其中以石沟的含水量最高,土面最低;不同土层的土壤含水量都有所增加,但增加幅度不完全一致;一年中土壤水分胁迫出现次数减少,频率降低。在持续干旱期间,水分蒸发量较大,覆盖后土壤保墒效果较好,平均每天水分损耗量较少,其中以薄膜覆盖效果显著,保墒能力最强,枯枝落叶和石面覆盖次之;但实地人工造林试验证明,石面及枯枝落叶覆盖下存活率很高,而薄膜覆盖较差。因此,薄膜覆盖在喀斯特峡谷区人工造林中的运用值得进一步研究。
In this paper,the capacity of soil moisture conservation of different microhabitats under different mulching technology in Huajiang karst typical valley area was studied.The results showed that the soil moisture change of soil surface,stone gully and stone pit is almost same by litter mulching,stone mulching and plastic mulching,among which the stone pit has the highest soil moisture content,while the soil surface is the lowest.The soil moisture content of all soil layers were increased,but the increasing extent was different.A frequency of the water stress was decreased in a year.Effects of soil moisture conservation is better,and daily average soil water loss is less under different mulching,among which plastic mulching is best,while that of litter mulching and stone mulching were followed.But by afforestation on the spot,the results showed that the survival rate of litter mulching and stone mulching is higher than that of plastic mulching.So afforestation under plastic mulching should be further studied in karst typical valley area.
出处
《中国水土保持科学》
CSCD
2010年第5期55-60,66,共7页
Science of Soil and Water Conservation
基金
国家重点基础研究发展规划项目"973"(2006CB4032066
2006CB403208
2006CB403204)
国家"十五"科技重大攻关计划项目(2004BA606A09)
贵州省省长基金项目(黔科教办[2001]3号)
贵州省科学技术基金(黔科合J字[2008]2104)
贵州省科技计划项目(黔科合NY字[2009]3052)