杉木-阔叶树复层混交林凋落物和土壤养分及化学计量特征  

Characteristics of Litter and Soil Nutrient Content and Stoichiometric Ratio in Mixed Forest Cunninghamia lanceolata and Broadleaved Trees

作　　者：姜年春 邱勇斌 张能军 宣铃娟 郑伟健 黄淦 胡卫明 JIANG Nianchun;QIU Yongbin;ZHANG Nengjun;XUAN Lingjuan;ZHENG Weijian;HUANG Gan;HU Weiming(Kaihua Forest Farm of Zhejiang,Kaihua 324300,China;Kaihua Forestry Development Company Limited of Zhejiang,Kaihua 324300,China;Kaihua Forestry Bureau of Zhejiang,Kaihua 324300,China)

机构地区：[1]开化县林场,浙江开化324300 [2]开化县林业发展有限公司,浙江开化324300 [3]开化县林业局,浙江开化324300

出　　处：《浙江林业科技》2024年第4期1-6,共6页Journal of Zhejiang Forestry Science and Technology

摘　　要：杉木纯林改造为杉木-阔叶树复层混交林,对提高杉木林质量具有重要意义,但林分结构改变如何影响凋落物和土壤养分化学计量特征尚缺乏系统研究。以浙西南不同杉木Cunninghamia lanceolata-阔叶树复层混交林为研究对象,分析了杉木纯林、杉木+柃木Eurya japonica、杉木+蚊母树Distylium racemosum及杉木+闽楠Phoebe bournei混交林凋落物和0~40 cm土层土壤碳、氮、磷含量及其化学计量特征。结果表明:相对于杉木纯林,杉木+柃木混交林凋落物有机碳含量显著降低,杉木+闽楠凋落物总磷含量显著增加,不同林分类型之间凋落物碳、氮、磷化学计量比变异相对较小。林分类型和土层显著影响土壤养分含量,杉木-阔叶树混交林土壤养分含量普遍高于杉木纯林,0~20 cm土层的平均土壤有机碳、总氮和总磷含量分别比杉木纯林增加25.2%、48.8%和50.0%,20~40 cm土层的平均土壤有机碳、总氮和总磷含量分别比杉木纯林增加26.9%、45.4%和47.6%。林分类型显著影响土壤碳磷比和氮磷比,并与凋落物化学计量显著正相关。因此,将杉木纯林转换为杉木复层混交林有助于改善土壤养分状况,但改良效果取决于树种组成,研究结果对加强杉木阔叶树复层混交林经营管理具有重要意义。In 1996,pure Cunninghamia lanceolata forest were afforested in Kaihua,Zhejiang province,in March 2015,1-year container seedlings of Eurya japonica,Distylium racemosum and Phoebe bournei were interplanted in pure C.lanceolata stand.In August 2018,sample plots with 100 m×100 m were established in different mixed forest with pure forest as the control.Litter and soil samples were collected for determination of organic carbon and total phosphorus content.The results showed that compared with the CK,the organic carbon content of litter in C.lanceolata+E.japonica plantation decreased significantly,and the total phosphorus content of litter in C.lanceolata+P.bournei plantation increased significantly,while the stoichiometric ratios of carbon,nitrogen,and phosphorus in litter had no great difference in different plantations.The stand type and soil layer had significant impact on soil nutrient content,and the mixed plantations showed higher soil nutrient contents than pure C.lanceolata plantation.Compared to that in pure C.lanceolata plantation,the average contents of soil organic carbon,total nitrogen and total phosphorus at 0−20 cm layer in mixed plantations increased by 25.2%,48.8%,and 50.0%,and that at 20−40 cm layer increased by 26.9%,45.5%and 47.6%.The stand type significantly affected the ratio of soil carbon and phosphorus,and of nitrogen and phosphorus,which had significant positive relation with litter stoichiometry.

关 键 词：杉木 混交林 凋落物 土壤养分 化学计量 

分 类 号：S725.2[农业科学—林木遗传育种]