樟树人工林对湘东退化红壤性质及微生物碳源利用的影响  

Effects of Cinnamomum Camphora Plantations on Properties of Degraded Red Soil and Utilization of Microbial Carbon Sources in Eastern Hu'nan

作　　者：张杰[1] 张海燕 赵姣[1] 金晓芳[1] 龚磊[1] 李凤[1] 金志农[1] ZHANG Jie;ZHANG Haiyan;ZHAO Jiao;JIN Xiaofang;GONG Lei;LI Feng;JIN Zhinong(College of Water Conservancy and Ecological Engineering,Jiangxi Provincial Engineering Research Center for Seed-breeding and Utilization of Camphor Trees,Nanchang Institute of Technology,Nanchang 330099)

机构地区：[1]南昌工程学院水利与生态工程学院,江西省樟树繁育与开发利用工程研究中心,南昌330099

出　　处：《水土保持学报》2018年第6期333-339,345,共8页Journal of Soil and Water Conservation

基　　金：江西省教育厅科技项目(GJJ151120);国家自然科学基金项目(31660599)

摘　　要：通过对湘东红壤丘陵区樟树(Cinnamomum camphora)人工林林下与林间土壤进行配对采样与分析,研究樟树人工林对退化红壤性质及微生物碳源利用的影响。结果表明:与林间土壤相比,林下土壤的pH增加0.95个单位,全磷、全钾和含水量分别提高14.8%,16.8%和45.6%,容重降低8.1%,均达到显著水平。樟树人工林显著增加林下土壤微生物的平均颜色变化率(average well color development,AWCD),林间土壤微生物对碳水化合物、氨基酸、羧酸、聚合物和酚酸类碳源的利用强度依次仅相当于林下土壤微生物的27.6%,19.2%,23.4%,47.1%和3.5%,但二者对胺类碳源的利用没有明显变化。樟树人工林显著增加林下土壤微生物的丰富度指数、多样性指数、优势度指数和均匀度指数。主成分分析发现,樟树人工林改变土壤微生物的碳源利用模式;相关性分析表明,樟林恢复后土壤理化性质的改善是造成微生物碳源利用能力和多样性指数提升的主要原因,而土壤pH是其中的首要驱动因素。综上,樟树人工林有助于提高湘东退化红壤的微生物生态功能,樟树是进行退化红壤生态修复和重建的适宜树种。In order to study the effects of Cinnamomum camphora plantations on properties of degraded red soil and utilization of microbial carbon sources in eastern Hu’nan,forest soil and non-forest soil samples were paired sampled and analyzed.The results showed that the pH in forest soil was significantly increased by0.95units compared with non-forest soil,and the total phosphorus,total potassium and water contents were significantly increased by14.8%,16.8%and45.6%,respectively.But the soil bulk density was significantly decreased by8.1%.The average well color development(AWCD)of soil microorganisms was significantly increased by long-term Cinnamomum camphora restoration.Furthermore,the microbial metabolic intensities of carbohydrates,amino acids,carboxylic acids,polymers and phenolic compounds in non-forest soil were only27.6%,19.2%,23.4%,47.1%and3.5%of those in forest soil,respectively.In addition,soil microbial functional diversity indexes were significantly increased by long-term Cinnamomum camphora restoration.Principal component analysis(PCA)showed that Cinnamomum camphora plantations changed the carbon sources utilization pattern of soil microbial community.Correlation analysis showed that the improved soil physical and chemical properties after Cinnamomum camphora restoration were reasons for the improvement of microbial carbon sources utilization capacity and functional diversity indexes,and among which,soil pH was the primary driving factor.In conclusion,Cinnamomum camphora plantations could improve the microbial ecological function of degraded red soil in eastern Hu’nan,and Cinnamomum camphora is a suitable tree species for ecological restoration and reconstruction of degraded red soil.

关 键 词：樟树人工林 植被恢复 退化红壤 土壤微生物 碳源利用 

分 类 号：S718.8[农业科学—林学]