摘要
在黑龙江东部的张广才岭选择典型次生杂木林进行不同采伐处理,一个生长季后测定了土壤潜在碳矿化速率和活性有机碳含量。结果表明:在28℃条件下经过90d的培养,土壤潜在碳矿化速率和碳矿化总量在所测定的土层中(0-10cm,10-20cm,20-30cm)均表现为:50%强度采伐>皆伐后农作>25%强度采伐≌对照>皆伐后造林的变化趋势,但各处理间差异不显著。土壤易氧化碳含量在3个土层50%强度采伐均显著高于对照。土壤微生物碳含量在0-10cm和10-20cm土层,50%强度采伐显著高于对照,在0-10cm土层,皆伐后造林显著低于对照。水溶性有机碳含量在0-10cm和10-20cm土层,50%强度采伐显著高于对照,在20-30cm土层,皆伐后造林显著低于对照。这说明在东北温带次生林中,较大强度的择伐短期内可增加土壤活性有机碳含量,而皆伐后造林可导致土壤活性有机碳出现下降趋势。
Responses of the potential carbon mineralization and labile organic carbon of soil to different harvest methods after a growing season were measured in second shaw growth of Zhangguangcai mountain in Heilongjiang province. The results showed： after 90 days of incubation,at 28℃,the potential mineralization rate and cumulative mineralized amount of soil organic carbon （SOC） from different plots range as follow： partial cut I （50% of the stand volume removed）,cropland （farming after clear cutting）,partial cut Ⅱ （25% of the stand volume removed）,uncut,afforestation （forestation after clear cutting）. There are no significant differences among different harvest methods. The amount of soil readily oxidation carbon （ROC） of partial cut I in all the three soil horizons is significantly higher than uncut. The amount of soil microbial biomass carbon （MBC） of partial cut I in the 0-10 cm and 10-20 cm soil horizons is significantly higher than uncut;in the 0-10 cm soil horizon,the amount of MBC of afforestation is significantly lower than uncut. The amount of water-soluble organic carbon （WSOC） of partial cut I in the 0-10 cm and 10-20 cm soil horizons is significantly higher than uncut,in the 20-30 cm soil horizon,the amount of WSOC of afforestation is significantly lower than uncut. The results suggests that after partial cut with greater intensity in short-term,the amount of soil labile organic carbon will increase,but after forestation following clear cutting it will decrease in the temperate second growth of northeast China.
出处
《水土保持学报》
CSCD
北大核心
2009年第6期139-143,共5页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(30671678)
关键词
次生林
土壤碳矿化
土壤活性有机碳
采伐干扰
second growth
soil carbon mineralization
soil labile organic carbon
harvest disturbance
