百喜草治理对退化红壤生态系统碳库及分配的影响

侵蚀退化红壤植被恢复后生态系统碳库变化的研究对全面认识生态恢复的作用以及碳汇经营具有重要意义．试验地位于福建省长汀县河田镇，本文以采用种植百喜草治理侵蚀退化地上典型“小老头”马尾松林（百喜草治理地）为对象，以相邻的未治理地为对照，研究生态系统及其各个分室碳库的变化．结果表明：侵蚀地种植百喜草治理后生态系统、乔木层及土壤层碳库均显著（P〈0．05）或极显著（P〈0．01）高于对照地，分别是对照的2．32倍、5．23倍和1．81倍．乔木层各器官碳贮量均显著高于对照地（P〈0．05），其中树干碳贮量增量最大．与对照地土壤相比，表层0—20em土壤碳贮量增量高达5．84t·hm^-2，同时土壤深层（20～100cm）碳库增量（6．04t·hm^-2）与其相当．对照地的土壤碳库占生态系统碳库的比例为70．88％，而百喜草治理地的土壤碳库所占比例下降至55．28％，表明侵蚀地种植百喜草治理后生态系统碳库分配趋于合理．因此，从森林碳汇与可持续经营角度出发，种植百喜革治理侵蚀退化红壤是一项可行有效的措施．

Effects of Pasplum notatum Fliigge on Carbon Storage Change and Allocation in an Ecosystem Developed on Degraded Red Soil

Studying carbon storage changes in degraded red soil after vegetation restoration has important significance to understand the effects of ecological restoration and carbon management. This paper Changting County, Fujian province. The results shows that, by planting Pasplum notatum Flugge, carbon storage of the ecological system, the tree stratum and the soil layer all significantly improved, which were respectively 2. 32 times, 5.23 times and 1.18 times as much as that in the control plot. The carbon storage of each organ in the tree stratum was significantly more than that of the control （P 〈 0. 05）, and the increment of the carbon storage of the trunk was biggest. Compared with the con- trol, the increment of the carbon storage of the 0 -20 cm soil layer was 5.84 t·hm^-2, similar to that of the 20-100 Cm soil layer （6. 04 t·hm^-2）. The percent of the soil layer carbon storage decreased from 70. 88% to 55.28%, showing an improved state of carbon storage distribution in the ecological system by planting Pasplum notatum Flugge. From the aspects of forest carbon sequestration and sustainable management, planting Pasplum notatum Flugge to the degraded red soil is a feasible and effective measure.