湘中丘陵区毛竹林土壤热水浸提有机碳的垂直分布与季节动态  

Vertical distribution and seasonal dynamics of soil hot water-extractable carbon of Phyllostachy edulis forests under different managing patterns in the hilly region of central Hunan,southern China

作　　者：漆良华 艾文胜[2] 范少辉 毛超 孟勇[2] 杨明[2] 

机构地区：[1]国际竹藤中心,北京100102 [2]湖南省林业科学院,长沙410004

出　　处：《华中农业大学学报》2013年第6期38-42,共5页Journal of Huazhong Agricultural University

基　　金："十二五"科技支撑项目(2012BAD23B04);国际竹藤中心基本业务重点专项(1632008005)

摘　　要：以湘中丘陵区笋用（Ⅰ）、笋材兼用（Ⅱ）、材用（Ⅲ）3种不同经营类型的毛竹林为研究对象,考察土壤热水浸提有机碳（hot water-extractable carbon,HWC）含量和储量的垂直分布、季节动态及其与土壤温度、湿度的关系。结果表明：笋用、笋材兼用和材用毛竹林0~20、20~40、40~60cm土层土壤平均HWC含量分别为21.59~84.54、21.41~58.95、24.70~61.58mg/kg,储量分别为0.14~0.53、0.14~0.41、0.15~0.37t/hm2;在垂直分布上,不同类型毛竹林碳含量、碳储量随土壤深度增加而下降,0~20cm土层是HWC的主要分布区;在季节动态上,不同类型毛竹林碳含量、碳储量均以1月最高,10月最低;在一定范围内,土壤温度上升、湿度增加将加速HWC的分解和矿化进程,HWC含量与土壤温度、湿度均呈现显著负相关性。土壤温度对HWC的影响符合三次多项式,湿度与HWC的回归关系符合生长模型。Based on plot data of shoot utilizing （ I ）, shoot and timber utilizing （ II ） and timber uti- lizing （[]I） of Phyllostachy edulis forests located at the hilly region in central Hunan, studies were car- ried out to investigate the vertical distribution, seasonal dynamics of soil hot water-extractable carbon （HWC） concentrations and storages in these three typical managing target patterns and its relationship with soil temperature and moisture. The results showed that the average HWC concentrations of type I , 1I and m were 21. 59-84. 54,21. 41-58. 95 and 24. 70-61. 58 mg/kg,respectively. The average HWC storages were 0. 14-0. 53,0. 14-0. 41 and 0. 15-0. 37 t/hmz, respectively. HWC concentrations and storages decreased with the increase of soil depth in three forests, moreover, the soil layers of 0-20 cm were the main distribution of HWC. For seasonal dynamics, HWC concentrations and storages were the highest in January and the lowest in October. HWC was negatively correlated with the soil temperature and moisture. The relationship could be described well by cubic polynomial and growth curve. It was ob- vious to some extent for HWC decomposition and mineralization aggravating with the rise of soil tem- perature and moisture.

关 键 词：毛竹 土壤热水浸提有机碳 垂直分布 季节动态 土壤温度 土壤湿度 

分 类 号：Q948[生物学—植物学]