摘要
分析了松嫩草原主要植物群落羊草群落、虎尾草群落、碱茅群落枯落物层的蓄积量及持水能力、枯落物层对降水的截留以及枯落物层抑制土壤水分蒸发的效应.结果表明,羊草群落枯落物蓄积量最大为4.7 t·hm^-2,最大持水量为9.6 t·hm^-2,最大持水率为208.4%;虎尾草群落枯落物层蓄积量、最大持水量和最大持水率分别为3.0 t·hm^-2、7.4 t·hm^-2和262.8%;碱茅群落分别为2.6 t·hm^-2、5.0 t·hm^-2和202.2%;3种群落枯落物层对降水的截留量分别为6.57、5.79和5.26 t·hm^-2,随着降雨量的增加,截留量增加,截留率减小;0.5～2 mm枯落物覆盖下不同含水量的土壤水分蒸发比无覆盖的土壤减少7.95%～56.79%,枯落物层减少土壤水分蒸发的效应随枯落物层厚度和土壤含水量的增大而增加.
With the litter layers of Leymas chinensis, Chloria virgata and Puccinellia tenuiflora communities on Songnen grassland as test objects, this paper studied their litter storage, water holding capacity, rainfall interception, and restraining effect on soil evaporation. The results showed that in the litter layers of L. chinensis, C. virgata and P. tenuiflora communities, the litter storage was 4. 7, 3.0 and 2.6 t·hm^-2, maximum water holding capacity was 9. 6, 7.4 and 5.0 t·hm^-2, maximum water holding rate was 208. 4%, 262. 8% and 202.2%, rainfall interception was 6. 57, 5.79 and 5.26 t·hm^-2, and interception rate was 6. 22%, 5.52% and 5.23%, respectively. The interception capacity was increased, while the interception rate was decreased with increasing rainfall. Under the cover of litter with a thickness of 0. 5-2 cm, soil evaporation was decreased by 7.95%-56. 79%, compared with that without litter cover. The restraining effect on soil evaporation increased with increasing litter thickness and soil water content.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第8期1722-1726,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金资助项目(30371020
30570273)
关键词
松嫩草原
枯落物
生态水文功能
Songnen grassland
litter
ecohydrological function
