生态环境学报Issue(4)：624-630,7.DOI:10.16258/j.cnki.1674-5906.2015.04.012
造林密度对樟子松人工林枯落物和土壤持水能力的影响
Effects of Different Afforestation Densities ofPinus Sylvesirisvar. Mongolica on the Water-holding Capacity of Forest Litter and Soil
摘要
Abstract
A case study was conducted at the Rare Sand Plant Protection Base, about 6 km north from Yulin city, which lies in north of Shaanxi province and the southern edge of Mu Us Sandland, China. For the purpose of comparing and analyzing the effects of 10 different density plantations ofPinus sylvesirisvar. mongolica on the water-holding capacity of forest litter and soil, 30 standard plots of artificial forest with the same site conditions (10 types of forest×3 replications) were investigated and the water-holding capacity of litter and soil were determined quantitatively. The ten types of sample plots were recorded asPⅠ,PⅡ,PⅢ,PⅣ,PⅤ,PⅥ,PⅦ, PⅧ,PⅨ, andPⅩ, and the afforestation densities of Pinus sylvesirisvar. mongolicawere 900, 1200, 1500, 1800, 2200, 2500, 2800, 3000, 3300 and 3600 plant·hm-2 respectively. The results showed that, (1) The total capacity of litter (TL) among 10 forest types, generally followed by the sequence of forest densities, were TLPⅢ=TLPⅣ>TLPⅩ>TLPⅧ>TLPⅨ>TLPⅥ>TLPⅦ>TLPⅤ>TLPⅡ>TLPⅠ; the maximum water-holding capacity and effective water-holding capacity of litter, for 10 forest types, were 2.46~8.23 t·hm-2 and 0.163~6.420 t·hm-2 respectively. The water-holding functions of litter inPⅢ andPⅣplotswere the best and was the worst inPⅠplot among the ten types. (2) There were no significant differences in water content, bulk density and the maximum water-holding capacity of soil amongst these forest types, with the variation ranges of 8.94%~16.54%, 1.10~1.66 g·cm-3 and 200.43~266.43 t·hm-2, respectively. However, the non-pore porosity of soil among these 10 forest types varied greatly, with a variation range of 0.99%~4.32%. The water-holding functions of soil were the highest inPⅢ andPⅣplots, and the lowest in thePⅠplot. (3) Power function model can better indicate high correlation coefficients between the water absorption rate of litter and its immersion time, and also between the water-holding capacity of litter and its soaking time. The stable infiltration rates of soil in 10 different forest stands were consistent, while they varied greatly with a range of 0.11~0.89 mm·min-1 after 20 minutes. And (4) in this study, the water-holding capacity of forest litter and soil inPⅢ andPⅣplots were the best, and the optimal afforestation density was 1500 to 1800 plants per hectare. The results show that thinning should be done timely and appropriately in this study area to prevent the recession of forest stand. Besides, it is unapproachable whetherPinus sylvesirisvar. mongolica can be planted in large scale or in high density, and further research is needed.关键词
枯落物/持水量/造林密度Key words
forest litter/water-holding capacity/afforestation density分类
农业科技引用本文复制引用
侯瑞萍,张克斌,郝智如..造林密度对樟子松人工林枯落物和土壤持水能力的影响[J].生态环境学报,2015,(4):624-630,7.基金项目
国家自然科学基金项目（30771764）；国家林业局荒漠化定位监测项目 （）
