小水电代燃料工程对黔东南人工林生态系统固碳效益的影响

研究小水电代燃料工程对人工林生态系统的固碳效益的影响，是小水电代燃料工程生态效益和可持续性评价的重要内容。本文选取贵州省麻江县小水电代燃料工程项目区内常绿阔叶次生林、马尾松人工林和柏木人工林为研究对象，以立地条件相近的非项目区马尾松人工林和柏木人工林为对照，通过外业调查和实验室测定，对比分析了不同林分生态系统碳储量间的差异。结果如下：（1）项目区内马尾松和柏木人工林的乔木层、林下层和土壤层碳储量均大于各自对照林分，其中在乔木层上碳储量差异显著（P<0.05）。（2）项目区内常绿阔叶次生林、马尾松和柏木人工林生态系统碳储量分别为153.70、88.25和36.69 Mg/hm²，其中次生林显著大于人工林，马尾松和柏木人工林均显著大于各自对照林分（P<0.05）。研究表明：（1）小水电代燃料工程增加了人工林生态系统碳储量，提高了人工林生态系统的固碳效益。（2）研究区内的植被恢复具有较高的固碳潜力。

Effect of small hydropower as a substitutes for fuel on carbon sequestration benefits in plantation ecosystem in southeastern Guizhou Province

Effect of small hydropower as a substitutes for fuel (SHSF) on plantation carbon sequestration plays important roles in ecological benefits and sustainability evaluation of the project. To investigate the dif-ferences of carbon stocks between the forest ecosystems, field sampling and laboratory test were conducted in three typical forest ecosystems within the project area in Majiang County,Guizhou Province. These forest ecosystems contain masson pine plantation (MP), wepping cypress plantation (WP) and secondary ever-green broad forest (SF). The MP and WP outside of the project area were chosen as contrast check (CK). The results are as follows:(1) carbon stocks of understory layer and soil layer in MP and WP are higher than the CK, respectively. The carbon stocks of tree layer in MP and WP are significantly higher than the CK respectively (P<0.05). (2) The carbon stocks in SF, MP and WP within the project area are 153.70, 88.25 and 36.69 Mg/hm², respectively. The carbon stocks are significantly higher in SF than the plantation, and carbon stocks of MP and WP are both significantly higher than the control plantation respectively (P<0.05). The results show that:(1) carbon stocks and carbon sequestration benefits of the plantation ecosys-tem are increased by SHSF, and (2) vegetation restoration has a high potential capacity of carbon seques-tration in the research area.