不同密度马尾松人工林凋落物及养分归还量的年变化特征  

The Annual Variation Feature of Litter and Nutrient Restitution in Different Density Pinus massoniana Plantation

作　　者：姚瑞玲[1] 丁贵杰[1] 王胤[1] 

机构地区：[1]贵州大学造林生态研究所

出　　处：《南京林业大学学报（自然科学版）》2006年第5期83-86,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：贵州省跨世纪人才课题(黔科合人字20009802);国家"九五"重点科技攻关课题(96-011-01-01)

摘　　要：在14年生的3种林分密度内，采用定期、定时、定点多样点收集器法，研究了林分凋落物及养分归还的年变化特征，结果表明：随着林分密度的增加，林分的年凋落物量为2745．821～4911．179kg／（hm^2·a）；凋落物中养分的年归还量分别为：氮15．558～27．374kg／（hm^2·a）、磷1．437～2．900kg／（hm^2·a）、钾12．393～25．365kg／（hm^2·a）、钙10．850～22．056kg／（hm^2·a）、镁2．487～3．278kg／（hm^2·a）。凋落物及养分归还的季节动态变化趋势均为秋季最多，冬季以之夏季、春季最低，除镁外，各季节凋落物及养分归还量均随林分密度的增加而增加。Taking the measure of many sampling plots＇ collector which was periodical, accurate and fix-spotted,this paper deals with the annual variation feature of litter and nutrient restitution in three kinds of density stand from 14-year-old Pinus massoniana. The results showed that with the increasing of density, the annual amount of litterfall was 2 745. 821- 4 911. 179 kg/（hm^2·a）respectively. The annual restitution amount of N,P,K,Ca and Mg in litter was 15.558 - 27.374 kg/（hm^2·a）, 1.437 - 2.900 kg/（hm^2·a）, 12.393 25. 365 kg/（hm^2·a）,10. 850-22. 056 kg/（hm^2·a） and 2. 487 -3. 278 kg/（hm^2·a）. The seasonal dynamics of forest litter and nutrient restitution was in the order of autumn,winter, summer,spring. Except for Mg, the bigger the density of plantation was, the more the amount of seasonal litterfall and nutrient restitution was.

关 键 词：马尾松 人工林 枯落物 养分归还 年变化 

分 类 号：S718[农业科学—林学]