摘要
在松嫩平原西部地区采用田间小区试验,研究了稻草秸秆覆盖措施对羊草育苗床土水热因子及其出苗率的影响。结果表明,对照处理虽然土壤温度条件优于稻草覆盖处理,但由于水分供应不足,显著地降低了羊草出苗率;与无稻草覆盖的对照处理相比,稻草覆盖处理水分含量明显高于对照,地表温度日变化幅度趋缓,具有良好保水作用和减缓温度日变化的作用。适量的稻草覆盖(200g/m2)能够同时兼顾保水和保温作用,出苗率最高,稻草秸秆覆盖是该地区春季羊草育苗比较有效的一项措施。
Field experiment was conducted to study the effect of different straw mulching on the hydro-- thermal factor of seedbed soil of Leymus chinensis in western Songnen Plain. The results showed that water retention of soil was restrictive factor which can affect the rate of emergence of CK significantly, though the thermal condition of CK was better than straw mulching; soil water content with straw mulching was obviously higher than contrast in 0-50 cm depth of soil, variation of temperature in one day inclined to moderation after straw mulching, straw mulching could raised the temperature greatly, and at same time the variation of soil temperature in one day inclined to moderation after straw mulching. Hydro--thermal factor could affect the rate of emergence of Leymus chinensis together, and appropriate thickness of straw mulching helped enhancing the rate of emergence, and the results showed that when the straw mulching quantity achieve appropriate amount（200g/m^2）, the rate of emergence was the highest. As a result, the application of straw mulching in the area was a effective measure in raising the rate of emergence in Spring.
出处
《中国草地学报》
CSCD
2008年第5期47-53,共7页
Chinese Journal of Grassland
基金
中科院知识创新工程前沿领域项目(KZCX3-SW-NA3-05)
国家科技部“973”项目(2007CB106800)
国家科技支撑重大项目(2006BAC01A08)
关键词
羊草
稻草覆盖
水热因子
出苗率
Leymus chinensis
Straw mulching
Hydro-- thermal factor
Rate of emergence
