陕北黄土丘陵区牧草枯落物对针叶纯林土壤极化的修复效应  

REMEDYING EFFECT OF FORAGE LITTERS ON SOIL POLARIZATION OF PURE CONIFEROUS FOREST IN SEMI-HUMID LOESS HILLY AREA OF NORTH SHAANXI

作　　者：邴塬皓 刘增文[2,3] Luc Nhu Trung 朱博超[2] 张晓曦[4] 吴艺楠 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学资源环境学院,陕西杨凌712100 [3]农业部西北植物营养与农业环境重点实验室,陕西杨凌712100 [4]西北农林科技大学水土保持研究所,陕西杨凌712100 [5]老街省农业与农村发展厅,越南老街330100

出　　处：《土壤学报》2014年第4期897-905,共9页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(31070630);西北农林科技大学大学生创新实验计划项目(2012年)资助

摘　　要：针对陕北半湿润黄土丘陵区的侧柏、油松和落叶松等针叶纯林,在前期关于土壤极化研究的基础上,通过采集林地腐殖质层土壤与7种不同牧草枯落物进行混合分解培养,研究不同牧草枯落物对针叶纯林土壤的修复效应,以此作为选择适宜修复牧草种的依据。结果表明:(1)针对侧柏纯林土壤,苜蓿等7种牧草对于速效钾含量,苜蓿、胡枝子、沙打旺、小冠花和草木樨对于蛋白酶活性的负向极化具有显著缓减作用。(2)针对油松纯林土壤,7种牧草对于碱解氮含量,毛苕子、苜蓿和草木樨对于有效磷含量,苜蓿对于蔗糖酶活性的负向极化均有显著缓减作用。(3)针对落叶松纯林土壤,胡枝子和红豆草对于碱解氮含量,苜蓿、红豆草、小冠花和毛苕子对于有效磷含量,除苜蓿和毛苕子外的其他牧草对于有机质含量,苜蓿以外其他牧草对于磷酸酶活性的负向极化均具有显著缓减作用。(4)综合主成分分析表明,对侧柏纯林土壤综合修复效果较好的依次为沙打旺、小冠花、胡枝子和毛苕子;对于油松纯林土壤综合修复效果较好的依次为苜蓿、小冠花和草木樨;对于落叶松纯林土壤综合修复效果较好的依次为苜蓿、草木樨和红豆草。Based on previous studies on soil polarization of mono-species coniferous forests,an incubation-for-decom- position experiment was conducted of mixtures of soil samples collected from humus layers of Platycladus orientalis,Pinus tabulaeformis and Larix principis-rupprechtii forests in the semi-humid loess hilly region of Shaanxi with litters of seven spe- cies of forage grass to explore effects of forage litters remedying pure coniferous forest soils and hence to accumulate scien- tific data for selection of suitable soil-remedying species of forage grass. Results show that in the pure P. orientalis forest soil,all the litters displayed significant effects mitigating the negative polarization of readily available K, and the litters of Medicago sativa ,Leapedeza bicolor,Astragalus adsurgens, Vicia villosa and Melilotus officinalis had similar effects on the ac- tivity of protease; in the pure P. tabulaeformis forest soil, all the litters had such similar effects on alkalytic N,those of V. viUosa ,M. sativa and Melilotus officinalis had on available P, and only the litter of M. sativa had on the activity of su- crase ; and in the pure L. principis-rupprechtii forest soil, the litters of L. bicolor and Onobrychis viciaefolia had such similar effects on alkalytic N, the litters of M. sativa, 0. viciaefolia, Coronilla varia and V. villosa had on available P, all the litters except those of M. sativa and V. villosa had on organic matter content,and all the litters except that of M. sativa had on the activity of phosphatase. Integrated PCA （principal component analysis） shows that in the pure P. orientalis forest,the litters of A. adsurgens, C. varia,L, bicolor and V. villosa had better comprehansive remediation effects on the soil,in the pure Pinus tabulaeformis forest, the litters of M. sativa, C. varia and M. officinalis had, and in the pure L. principis-rupprechtii forest,the litters of M. sativa,M, officinalis and 0. viciaefoli had.

关 键 词：针叶纯林 土壤极化 牧草枯落物 

分 类 号：S714.2[农业科学—林学]