摘要
为桉树人工林的土壤质量评价提供科学依据，研究了不同林龄(1a、2a、3a、5a、7a)尾巨桉林地0~60cm土壤和枯落物的碳含量及碳储量，测算了不同林龄桉树林地叶面积指数，乔木层、灌木层、草本层和枯落物层生物量。结果表明：土壤有机碳含量随土层深度增加而呈降低趋势，不同林龄0~20 cm土层有机碳含量差异显著，不同林龄相同土层之间土壤有机碳储量差异不显著；枯落物碳储量差异显著，大小顺序为：5 a (4.83 t·hm-2)>7 a (3.89 t·hm-2)>3 a (2.66 t·hm-2)>2 a (2.43 t·hm-2)>1 a (1.56 t·hm-2)；0~60 cm土层土壤碳储量与叶面积指数呈负相关关系，与林龄、乔木层生物量、灌木层生物量、草本层生物量、枯落物层生物量之间呈正相关性，但相关性都不显著。
Abstract
Soil organic carbon content and storage of the uppermost 60 cm of soil along with the carbon content and reserves of litterfall of Eucalyptus urophylla × E. grandis plantations at different ages (1 a, 2 a, 3 a, 5 a, 7 a) were studied to provide the scientific basis for the soil quality assessment and sustainable plantation development. Leaf area index, biomass of the tree, bush, herbaceous and litter layers in eucalypt plantations were measured. The results showed that soil organic carbon content in the uppermost 60 cm of plantation soil decreased as depth in the soil profile increased. In addition, soil organic carbon (SOC) content changed significantly in surface soil (0~20 cm). No significant differences were found in SOC storage in the one soil layer between different ages. In contrast, differences among carbon storage in litter changed significantly with age in the order of:5 a (4.83 t·hm-2) > 7 a (3.89 t·hm-2) > 3 a (2.66 t·hm-2) > 2 a (2.43 t·hm-2) > 1 a (1.56 t·hm-2). SOC storage was not significantly correlated with stand age, leaf area index, biomass of tree layer, bush layer, herbaceous layer nor litter layer. Soil organic carbon storage of the top 60 cm of soil was negatively correlated with leaf area index and positively correlated with stand age, biomass of tree layer, bush layer, herbaceous layer and litter layer though these correlations were not significant.
基金项目
广东省林业科技创新专项(2014KJCX021－04)
广东湛江桉树林生态系统国家定位观测研究站(2015-LYPT-DW-006)
NETL
NSTL
维普
万方数据