蕉岭长潭省级自然保护区表土有机碳的研究

基于UTM公里网格方法划分的66个网格的土壤剖面数据,分析了蕉岭长潭自然保护区5种典型植被类型（马尾松林、杉木林、针阔混交林、阔叶混交林和竹林）的表层土壤（0～20 cm）有机碳含量、密度、储量的分布特征与影响因子。结果表明：（1）表土有机碳含量SOC分布在12.61～66.19 g·kg^-1之间,平均值为30.87±1.30 g·kg^-1,大小顺序为竹林〉阔叶混交林〉针阔混交林〉杉木林〉马尾松林,多重比较显示竹林（37.63 g·kg^-1）显著高于马尾松林（18.52 g·kg^-1）,马尾松林仅为竹林的49.21%。（2）表土有机碳密度SOCD在3.27～15.69 kg·m^-2间,平均值为8.22±0.39 kg·m^-2,大小排序为阔叶混交林〉竹林〉针阔混交林〉杉木林〉马尾松林,阔叶混交林（10.15 kg·m^-2）和竹林（9.96 kg·m^-2）的SOCD值显著高于马尾松林（4.82 kg·m^-2）（p=0.005,p=0.036）,马尾松林仅是阔叶混交林的47.49%。（3）蕉岭长潭保护区表土层有机碳储量为402 100 t,占总面积54.54%的针阔混交林贡献最大,其次为阔叶混交林、杉木林、竹林和马尾松林。（4）表土有机碳含量与土壤全氮、速效钾含量显著正相关,相关系数分别为0.40和0.31;与石砾含量极显著负相关,相关系数达到-0.76。与林下植物分布有密切联系,有机碳含量〈20 g·kg^-1的指示种有6种,包括千年桐、黄毛楤木、米碎花、谷木冬青、长叶冻绿和乌韭,有机碳含量〉40 g·kg^-1的指示种有光叶海桐和土茯苓,有机碳含量在20～40 g·kg^-1间还未发现指示种。

The Research on Topsoil Organic Carbon in Jiaoling Changtan Nature Reserve,Guangdong Province, PRC

Soil organic carbon is the main part of terrestrial carbon pool, it plays an important role in terrestrial carbon cycle, and is one of the most important components in the research of global change. Based on the UTM grid method, the paper aims to analyze soil organic carbon content （SOC） distribution patterns in Jiaoling Changtan Nature Reserve, and to determine which factors affect those patterns. There are 66 plots that process 1 km × 1 km UTM sample plots in the five major patch types which was pinus forest, chinese fir forest, mixed conifer, broad-leaved mixed forest, and bamboo forest . This paper adopted the forest distribution areas, sampling data and soil organic contents from each samples ,the results were as follows, （1） Soil organic carbon content was 12.61 -66.19 g · kg^-1 ,the mean was 30.87 ±1.30 g· kg^-1. The sequence was in the order of bamboo forest 〉 broad-leaved mixed forest 〉 mixed conifer 〉 chinese fir forest 〉pinus forest, there was significant difference between bamboo forest and pinus forest. The highest is 37.63 g · kg^-1 that was in bamboo forest and the lowest of 18.52 g· kg^-1 in pinus forest. So the lowest is 49.21% of the highest. （2） Soil organic carbon density was 3.27 15.69 kg · m^ -2 ,the mean was 8.22 ± 0.39 kg · m^-2 ,and CV was 5.97% ,and the range order is broad-leaved mixed forest （10.15 ±0.73 kg · m^-2） 〉 bamboo forest （9.96 ± 1.29 kg · m^-2） 〉 mixed conifer （7.58± 0.46 kg · m^-2 ） 〉 chinese fir forest （7.46 ±1.79 kg · m^-2 ） 〉 pinus forest （4.82±0.78 kg· m^-2 ） ,there was significant difference between pinus forest and broad-leaved mixed forest （p = 0. 005 ） and bamboo forest（p = 0. 036 ）, so the lowest is 47.49% of the highest. （3） The carbon storage was 402 100 t in 50. 591 4 km^2 ,and the mixed conifer type is the biggest due to its area is 54.54%, and other is broad-leaved mixed forest 〉 chinese fir forest 〉 p = 0.000）, and significantly related with the understory vegetation, there a