Song Xiao-Yan, Zhang Dan-Ju, Zhang Jian, Li Jian-Ping, Deng Chang-Chun, Deng Chao
Ying Yong Sheng Tai Xue Bao. 2014 Nov;25(11):3083-90.
The effects of forest gap size on the distribution of soil aggregates, organic carbon and labile organic carbon were investigated in a 39-year-old Pinus massoniana plantation in Yibin, Sichuan Province. The results showed that the composition of soil aggregates was dominated by particles > 2 mm, which accounted for 51.7%-78.7% of the whole soil samples under different sized forest gaps and beneath P. massoniana plantation. Soil organic carbon content and labile organic carbon content in > 5 mm aggregates were significantly positively correlated with the soil organic carbon and labile organic carbon contents. Furthermore, the amounts of organic carbon and labile organic carbon storage > 5 mm particles were higher than those in other size particles. Therefore, particles > 5 mm of aggregates dominated the soil carbon pool. Compared with those P. massoniana plantations, the contents of organic carbon in aggregates and total topsoil decreased during the formation of forest gaps, whereas the soil organic carbon storage under 1225 m2 gap was higher. In addition, the soil labile organic carbon content under 225 and 400 m2 gaps and the labile organic carbon storage under 225, 400, 900 and 1225 m2 gaps were higher than those the plantations, but were lower than under the other gaps. It was suggested that an appropriate size of forest gap would increase the accumulation of soil organic carbon and labile organic carbon content. The size of forest gap had significant effects on the distribution of soil aggregates, organic carbon and labile organic carbon. The soil sample under 1225 m2 gap had the highest organic carbon content and storage and a better aggregate proportion, and the higher labile organic carbon storage. Therefore, it was suggested that 1225 m2 gap might be an optimal logging gap size.
在四川省宜宾市一片39年生的马尾松人工林中，研究了林隙大小对土壤团聚体、有机碳和活性有机碳分布的影响。结果表明，土壤团聚体组成以>2 mm的颗粒为主，在不同大小林隙及马尾松人工林下，该粒径颗粒占整个土壤样品的51.7%-78.7%。>5 mm团聚体中的土壤有机碳含量和活性有机碳含量与土壤有机碳和活性有机碳含量显著正相关。此外，>5 mm颗粒的有机碳和活性有机碳储量高于其他粒径颗粒。因此，>5 mm的团聚体颗粒主导了土壤碳库。与马尾松人工林相比，林隙形成过程中团聚体和表层土壤总有机碳含量下降，而1225 m2林隙下的土壤有机碳储量更高。此外，225和400 m2林隙下的土壤活性有机碳含量以及225、400、900和1225 m2林隙下的活性有机碳储量高于人工林，但低于其他林隙。研究表明，适宜大小的林隙会增加土壤有机碳积累和活性有机碳含量。林隙大小对土壤团聚体、有机碳和活性有机碳的分布有显著影响。1225 m2林隙下的土壤样品有机碳含量和储量最高，团聚体比例较好，活性有机碳储量也较高。因此，建议1225 m2林隙可能是最佳的采伐林隙大小。
