摘要
为了探明两苗互作育苗提高棉苗素质的机理,本试验在塑料温棚20～30℃、自然光照条件下,采用532×280mm2具有200方形孔的塑料育苗盘,用土壤作基质,以棉花单作育苗为对照,研究了棉花分别与小麦、玉米、谷子和高粱同穴互作育苗对土壤微生物、酶活性及根系分泌物的影响。结果表明,随互作苗的加入,育苗土壤中细菌和放线菌数量显著增加,真菌数显著降低;脱氢酶、中性磷酸酶、转化酶和脲酶活性显著提高;2,4-二叔丁基苯酚、2,6-二叔丁基苯酚、邻苯二甲酸二丁酯和9-16碳烯酸甲酯根系分泌物的积累量显著减少,棉苗则表现为根系活力、叶片可溶性糖含量和ATP含量显著提高,增加了棉苗根重、苗重和侧根数,棉苗离床存活期延长,栽后缓苗期缩短。在四种互作处理中,以棉花+小麦、棉花+谷子处理中棉苗素质表现较好。综上,两苗同穴互作育苗改善了育苗土壤微生物数量和结构,这可能是提高土壤酶活性和降低土壤有害根系分泌物积累的主要原因,进而提高了棉苗素质。
To reveal the mechanism of promoting the growth of cotton seedlings using other seedlings, effects ofmutual aid grow seedlings of cotton with wheat, maize, millet and sorghum separately in the same aperture on soil microorganisms quantity and enzyme activity and root secretion were studied using 532 mm × 280 mm lastic tray with 200 square holes full of soil under greenhouse and natural light condition. The results indicated that the amounts of soil bacteria and actinomyces under the mutual aid grow seedlings of cotton with other crops in the same apertures are significantly increased, while the amounts of soil fungi are significantly decreased. The activities of soil dehydrogenase, neutral phosphatase, zymose and urease are increased significantly, and the accumulations of 2,4 -di-tert-butylphenol, 2,6 -di-tert-butylphenol, dibutyl phthalate and methyl palmitoleate are decreased significantly, which results in the increases of root vitality, the contents of soluble sugar and ATP in the leaves, the weights of cotton seedlings and roots and the number of lateral roots. Moreover, survive days depart from seedbed are increased, while the convalescent oeriod of seedlinzs after transplanting are shortened compared with that insingle cotton seedling treatment. Among the treatments, of cotton seedlings. In conclusion, the mutual aid grow wheat and millet are the best choices to promote the growth seedlings of two different crops in the same aperture can improve the soil microbial structure and amount, and the causation of the increases of the soil enzyme activities and exudates. cotton seedling quality these are possibly primary the decreases of the accumulation of harmful root
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2012年第6期1475-1482,共8页
Journal of Plant Nutrition and Fertilizers
基金
国家农业科技成果转化基金项目(2009GB2D000214)资助
关键词
互作育苗
土壤微生物
土壤酶活性
根系分泌物
棉苗素质
mutual aid grow seedlings
soil microorganism
soil enzyme activity
root secretion
cotton seedling quality
