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Influence of long-term different fertilization on soil weed seed bank diversity of a paddy soil under rice/rape rotation

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Frontiers in Biology 2008年第3期3卷 320-327页

作者： Wei FENG Genxing PAN Sheng QIANG Ruhai LI Jiguang WEI Institute of Resource Ecosystem and Environment of Agriculture Nanjing Agricultural UniversityNanjing 210095China Weed Research Laboratory Nanjing Agricultural UniversityNanjing 210095China Anhui Academy of Forestry Hefei 230031China

A long-term fertilized paddy field under rice/rape rotation in the Taihu Lake Region was selected to investigate the dynamics of soil weed seed *** fertilizer treatments were performed,including non-fertilizer(NF),chemical fertilizer only(CF),chemical fertilizer combined with pig manure(CMF)and chemical fertilizer plus crop stalk(CSF).We recorded the seed numbers and crop yields,estimated the weed seed bank density and identified the kinds of weed seeds in the top-soil(0-15 cm)in the study area using a *** on the records,we analyzed the effect of long-term fertilization on soil weed seed bank diversity and the rela-tionship between weed seed diversity and crop *** the four treatments,it was found that in the cultivating seasons of both rice and rape,the density of soil weed seed bank was the lowest with the treatment of chemical fertilizer plus crop ***,the total number of species and the weed seed bank diversity was the ***,the crop yields were at maximum and kept constant with this *** was a definite correlation between fertilizer treatment and soil weed seed bank diversity and crop *** was concluded that balancing the fertilizer management was helpful in main-taining soil weed seed bank diversity,increasing crop yields and alleviating crop yield ***,among the four fertilizer treatments,chemical fertilizer plus rice crop stalk treatment was the best one to stimulate the productivity of agricultural ecosystems and simulta-neously protect biodiversity.

关键词： soil weed seed bank rice/rape rotation biodiversity fertilizer treatment

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