套种雷公藤人工林凋落物持水性能的研究

Water Holding Capacity of Litter in Artificial Forests Intercropped with Tripterygum wilfordii

运用野外实地测量和室内浸提法对4种套种雷公藤人工林凋落物持水量、持水率和吸水速率进行了研究。结果表明:4种林分的凋落物最大持水量大小为杉木林(11.66 t/hm2)>马尾松林(6.81 t/hm2)>厚朴林(5.90 t/hm2)>纯林(4.28 t/hm2);在不同浸泡时间段,林分的凋落物持水率大小为厚朴林>纯林>马尾松林>杉木林;凋落物最大持水率为厚朴林(205.12%)>纯林(163.33%)>马尾松林(139.33%)>杉木林(120.96%);4种不同种植模式雷公藤林分的凋落物吸水速率大小为厚朴林>纯林>马尾松>杉木,浸泡0.5 h后的吸水速率分别为2 630.05、2 407.32、2 035.09和1 592.14 g/kg/h。凋落物持水量与浸泡时间、凋落物持水率与浸泡时间呈现极显著的(P<0.01)对数递增函数关系,凋落物吸水速率与浸泡时间呈现出极显著的(P<0.01)递减幂数函数关系。

By the methods of using soaking extract method and field investigation, we studied the water-holding capacity, water-holding rate, and water-absorption rate of litter in four kinds of Tripterygum wilfordii of plantation. The results were as follows： The maximum water holding capacity in 4 types of forests are Chinese fir （11.66 t/hm2） 〉 masson pine （6.81 t/hm2） 〉 magnolia （5.90 t/hm2）〉 pure forest （4.28 t/hm2）. Under different soaking time, litter water holding rate showed magnolia 〉 pure forest 〉masson pine〉 fir forest. Maximum water holding rate of the litter is of magnolia 205.12% 〉 pure forest 163.33%〉 masson pine139.33% 〉 Chinese fir 120.96%. Stand water absorption rate of 4 different planting patterns is magnolia〉 pure forest 〉 masson pine 〉 Chinese fir, and water absorption rate after 0.5 hours were 2630.05, 2407.32, 2035.09 and 1592.14 g/kg/h. The relationship between water holding capacity of litter with the soaking time, water retention rate with the soaking time increased according to logarithmic equation（P〈0.01）, the relationship between water absorption rate and soaking time decreased according to exponential equation（P〈0.01）.