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海南文昌3种森林类型凋落物及土壤有机碳现状分析 被引量:13
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作者 陈小花 余雪标 +3 位作者 薛杨 王小燕 崔喜博 丁熙 《热带作物学报》 CSCD 北大核心 2014年第10期2043-2049,共7页
针对海南文昌滨海台地3种森林类型(人促更新次生林、次生林、椰子林)林下枯落物现存量及土壤活性有机碳性状(有机碳、易氧化有机碳及轻组有机碳含量)进行了测定。结果如下:3种林型凋落物层现存量及总碳储量分别为:椰子林4.53、1.51 t/h... 针对海南文昌滨海台地3种森林类型(人促更新次生林、次生林、椰子林)林下枯落物现存量及土壤活性有机碳性状(有机碳、易氧化有机碳及轻组有机碳含量)进行了测定。结果如下:3种林型凋落物层现存量及总碳储量分别为:椰子林4.53、1.51 t/hm2;次生林1.76、0.65 t/hm2;人促更新次生林1.53、0.60 t/hm2;均为分解层(包括半分解层和全分解层)>未分解层。1 m深土层深度内,3种林型土壤SOC、EOC及LFOC含量变化规律一致,均呈下降趋势,且不同林型不同土层间各组分含量差异显著(p<0.05)。经相关性分析表明,土壤SOC、EOC及LFOC相互之间具有显著正相关。说明在土壤母质、土壤类型、气候条件基本一致条件下不同植被类型土壤碳库组分比例及变化规律相似,但土壤各组分含量大小各异,从土层分布情况来看,林下凋落物质量和人为因素是碳储量关键影响因子。 展开更多
关键词 海南 凋落物 土壤soc含量 土壤EOC含量 土壤LFOC含量
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Changes in SOC and Nutrients under Intensive Tillage in Two Types of Slope Landscapes 被引量:11
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作者 LI Fucheng ZHANG Jianhui SU Zhengan 《Journal of Mountain Science》 SCIE CSCD 2012年第1期67-76,共10页
The net effect of tillage erosion on soil properties would be associated with the spatial variation in soil constituents,and therefore plays an important role in ecological agriculture.We conducted a consecutive tilla... The net effect of tillage erosion on soil properties would be associated with the spatial variation in soil constituents,and therefore plays an important role in ecological agriculture.We conducted a consecutive tillage by hoeing 15 times during a period with no rainfall in the two slope landscapes(a linear slope and complex slope) of the Yangtze Three Gorges reservoir areas,to examine the relationship between soil erosion rates and the variations in soil chemical properties and compare the effects of soil redistribution on SOC and nutrients between the linear and complex slopes.After the simulated tillage,notable changes in 137 Cs inventories of the soil occurred in the summit and toeslope positions on the linear slope,while there were significant changes in 137 Cs inventories at convex and concave positions on the complex slope.Soil profile disappeared at the summit slope boundary,with the exposure area of 16.0% and 7.6% of the experimental plot,respectively,for the linear and complex slopes due to no soil replacement.Soil organic C and nutrients were completely depleted with the disappearance of soil profiles at soil eroding zones,whereas a remarkable increase in SOC,total N and available nutrient concentrations of the post-tillage surface soil and a decrease in total nutrient concentrations(P and K) were found at depositional zones on the linear slope.For the complex slope,however,changes in SOC and nutrient concentrations of the post-tillage surface soil exhibited a patterndifferent from that on the linear slope,which showed a remarkable decrease in SOC and total nutrient concentrations but a slight increase in available nutrient concentrations after tillage in the toeslope position.Due to the gradual increase in soil depth from top to bottom of the slope,SOC and nutrient inventories in the soil profiles were significantly correlated with soil redistribution rates on both the linear and complex slopes.Tillage causes remarkable changes of soil chemical properties in the surface soil layer and soil profile,and increases SOC and nutrient inventories for the soil profile downslope in steeply sloping landscapes. 展开更多
关键词 soc Soil chemical property Complex slope Tillage erosion Three Gorges reservoir area
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蕉岭长潭省级自然保护区表土有机碳研究 被引量:8
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作者 周毅 黎艳明 +6 位作者 郭乐东 钟军民 李召青 钟锡均 汤明霞 张卫强 甘先华 《广东林业科技》 2009年第5期1-7,共7页
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... 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。 展开更多
关键词 土壤有机碳含量(soc) 土壤有机碳密度(socD) 土壤有机碳储量(socR) 长潭自然保护区
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