摘要
研究湖南会同连栽第2代杉木人工纯林和撂荒对第1代杉木人工林采伐迹地土壤养分与酶活性的影响。结果表明:0～30cm和30～60cm土层中,撂荒地土壤有机质、养分含量普遍高于连栽杉木人工林地,且腐殖质碳、有效磷含量的差异均达到极显著水平(P<0.01),全磷含量在0～30cm土层中的差异达到显著水平(P<0.05)。0～30cm土层中,撂荒地过氧化氢酶活性极显著高于连栽杉木人工林地(P<0.01),磷酸酶、脲酶、蔗糖酶活性均显著高于连栽杉木人工林地(P<0.05),30～60cm土层中,撂荒地过氧化氢酶、蔗糖酶活性也显著高于杉木人工林地(P<0.05),磷酸酶和脲酶活性也高于连栽杉木人工林地,但差异不显著(P>0.05)。林地土壤过氧化氢酶、磷酸酶、脲酶、蔗糖酶活性与土壤有机质、养分含量之间均呈较好的正相关,而且与水解氮、速效磷、腐殖质碳的相关性高于其与有机质的相关性。主成分分析表明,土壤酶活性在林地土壤质量体系中扮演着重要角色,其中脲酶、蔗糖酶和磷酸酶可作为林地土壤质量评价的指标。撂荒具有更好地恢复土壤养分含量和酶活性的能力,对维持杉木人工林地持续生产力有着重要作用。
Effects of successive rotation and natural restoration after fallow on forest soil nutrient contents and enzyme activities in the first generation Chinese Fir（Cunninghamia lanceolata）forests after clear-cutting were studied at Huitong Ecological Station,Hunan Province.Results showed that soil organic matter and nutrient contents of the naturally restored forests after fallow were generally higher than those of successive rotation of Chinese fir plantation in 0-30 cm and 30-60 cm layers.The differences in available phosphorus and humus carbon content were extremely significant,and the difference in total phosphorus content in 0-30 cm soil layers was significant.In the natural restoration forest,the activities of phosphatase,uresa and sucrase were significantly higher than those in successive rotation of Chinese fir plantation,and hydrogen peroxidase activity in 0-30 cm soil layers was extremely significant higher than that of the successive rotation forest,In 30-60 cm soil layers,the activities of Hydrogen peroxidase and sucrase in the natural restoration forest were significantly higher that in the successive rotation forest,however there was no significant difference in the activities of phosphatase and uresa.The activities of hydrogen peroxidase,phosphatase,uresa and sucrase had an extreme positive correlations with soil organic matter and nutrient contents,among which the correlations with hydrolysable N,available P and humus carbon were more significant than those with organic matter.Principal component analyses also indicated that soil enzyme activities played an important role in soil quality of forest ecosystem,of which the activities of phosphatase,uresa and sucrase could be used as indicators of soil quality in forest ecosystem.Natural restoration after fallow was able to restore soil nutrient contents and enzyme activities,and played an important role in maintaining sustainable forest-land productive forces of Chinese fir plantation.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2009年第12期65-71,共7页
Scientia Silvae Sinicae
基金
科技部公益性研究项目(2007415)
国家野外科学观测研究站项目(20060515
20070822)
国家林业局软科学项目(2007R23)
关键词
湖南会同
杉木人工林
采伐迹地
连栽
撂荒
土壤养分
酶活性
Huitong, Hu＇nan Province
Chinese Fir plantation
successive rotation
clear-cutting forestland
natural restoration after fallow
soil nutrients
enzyme activities
