杉木毛红椿混交林生物量结构研究

Biomass Structure of Mixed Forests of Cunninghamia lanceolata and Toona cilliata var. pubescens

本文对杉木毛红椿8:1混交林(A1)、间伐后调控为杉木毛红椿4:1混交林(A2)及其相对应的杉木纯林的生物量结构进行研究。研究结果表明:不同林分乔木层生物量A1>B1,A2>B2。A2比B2增加17.6%,A1比B1增加3.2%,混交林具有较高的生物量。平均木在各器官的分配比例不论是混交林,还是杉木纯林中杉木均表现为:干>叶>枝;混交林中毛红椿表现为干>枝>叶。干生物量最高。14年生A2林分中,毛红椿枝叶主要分布在6、7层,其二层枝叶量占总枝叶量66.3%,叶量占了总叶量的62.5%,而混交林中杉木枝叶主要分布在3、4、5三层,其三层枝叶量占了总枝叶量84.3%,叶量占了总叶量的83.9%。杉木毛红椿混交林冠层分布层次较明显,结构合理。A2中毛红椿平均木生物量与A1比增加7.3%;A2中杉木平均木生物量分别比A1、B1、B2中杉木增加12.7%、18.7%和12.1%。保留混交方式,并及时调控混交密度和比例有利于单株生物量的积累。

The biomass structures of mixed forests of Cunninghamia lanceolata and Toona cilliata var. pubescens at the proportion of 8：1 （A1）, after thinning regulation as mixed forests of C. lanceolata and T. ciUiata var. pubescens at the proportioh of 4：1 （A2） and its corresponding pure plantation were studied. The results showed that： the different stands of tree biomass were A1〉B1, A2〉B2, respectively. A2 was increased than B2 by 17.6%, A1 was increased than B1 by 3.2%, mixed forests have a high biomass. The allocation proportion of C. lanceolata of average wood in various organs whether in the mixed forest, or pure fir forest showed as stem〉 leaf〉 branch; in mixed forests T. cilliata var. pubescens showed as stem 〉 branch〉 leaf. Stem biomass was the maximum. In the 14-year-old A2 stands, the branches and leaves of T. cilliata var. pubescens were mainly distributed in 6th, 7th layer, the amount of foliage in the second layer accounted for 66.3% of the total amount of foliage, leaves accounted for 62.5% of the total leaves; but for C. lanceolata in the mixed forests were mainly distributed in 3rd,4th,Sth layer, the amount of foliage in the third layer accounted for 84.3% of the total amount of foliage, leaves accounted for 83.9% of the total leaves. The canopy distribution level of mixed forests was more obvious, reasonable structure. Compared the average wood biomass of T. cilliata var. pubescens in A2 with A1, was increased than A1 by 7.3%; the average wood biomass of C. lanceolata in A2 was increased than A1,B1,B2 f by 12.7%, 18.7% and 12.1%, respectively. Retaining the mixed mode and timely regulating the mixed density and proportion were conducive to the accumulation of plant biomass.