摘要
以地处黄土丘陵沟壑区的宁夏海原县南华山为研究区域,采用蒋柏藩、顾益初的土壤无机磷分级体系,对不同植被恢复类型(灌木、草地、乔木、乔灌混交)下土壤无机磷形态分布特征进行研究。结果表明:除草地外的植被恢复模式下土壤有机质、全氮含量明显高于农田,其中乔木林地和乔灌混交林地高于灌木和草地,土壤pH、全钾和全磷在不同恢复模式下无明显差异。黄土丘陵沟壑区土壤总无机磷含量在225.19～322.75mg·kg-1之间,占全磷的比例在36.18%～72.39%之间,其中以Ca10-P含量最高,其他形态含量顺序为Ca8-P>Fe-P>Al-P>Ca2-P>O-P。4种植被恢复模式下土壤无机磷总量、占全磷的比例及Ca10-P均高于农田,Ca8-P、Al-P和Fe-P则低于农田;灌木和草地无机磷总量和占全磷比例高于乔木林地和乔灌混交林地。对各无机磷形态与速效磷相关性分析表明,Ca2-P、Ca8-P、Al-P、Fe-P与速效磷呈极显著正相关关系,无机磷形态的生物有效性顺序为Al-P>Ca8-P>Fe-P>Ca2-P。因此,黄土丘陵沟壑区不同植被恢复模式对土壤养分和无机磷分布的影响存在一定的差异,植被恢复应以草地和低矮灌丛作为先锋植被,后以乔木代替灌草丛。
Phosphorus（P） has generally been assumed to be one of the limiting factors for plant growth in Loess plateau.This study selects shrub,grass,forest and shrub-forest cross fields in gully region of Nanhua mountain,Haiyuan County of Loess plateau as the research objects to investigate the distribution of inorganic P affected by vegetation restoration.The results showed that the contents of soil organic matter and total nitrogen in the restoration system were higher than cultivated land except in grassland,whereas their content in forest and shrub-forest cross field were higher than in shrub and grass field.Soil pH,total potassium and total P content were similar among the restoration system.The content of total inorganic P in the research area was varied from 225.19 mg·kg-1 to 322.75 mg·kg-1,which accounted for 36.18% to 72.39% of the total P.Ca10-P was the dominant fraction in the total inorganic P.The order of other inorganic P fractions showed as Ca8-PFe-PAl-PCa2-PO-P.The content of total inorganic P and their proportion of total P,as well as Ca10-P in the restoration system were higher than that in the cultivated land,and that Ca8-P,Al-P and Fe-P were lower than cultivated land.The content of total inorganic P and their proportion of total P were higher in shrub and grass field than that in forest and shrub-forest cross field.The relationships of all the contents of inorganic phosphorus fraction versus available P showed that there were significant positive correlations between Ca2-P,Ca8-P,Al-P and Fe-P and available P.The bioavailability of the inorganic fractions showed as Al-PCa8-PFe-PCa2-P.Therefore,vegetation restoration had different effects on soil nutrients and soil inorganic P fractions distribution in the gully region of Loess plateau.Grassland and low shrub should be as pioneer vegetation during vegetation restoration process,and a few years later they should be replaced by the forest in the gully region of Loess plateau.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第1期56-62,共7页
Journal of Agro-Environment Science
基金
国家自然科学基金(31100516
30872073)
关键词
植被恢复
黄土丘陵沟壑区
土壤无机磷形态
vegetation restoration
the gully region of Loess plateau
soil inorganic phosphorus
