摘要
采用水培法收集棉花根系分泌物,在耕作1年的土壤中添加棉花根系分泌物,培养10 d后测定土壤中速效养分、酶活性及微生物数量。结果显示,（1）棉花根系分泌物能极显著提高土壤中速效K和速效P含量4.31%~15.03%和5.99%~24.31%（P〈0.01）;高浓度分泌物处理下速效N含量比对照显著提高11.39%（P〈0.05）,其它处理影响不显著;各浓度分泌物对土壤有机质含量均无显著影响。（2）各浓度棉花根系分泌物均使土壤中转化酶活性显著提高,且随分泌物浓度的增加而显著增强;低浓度分泌物能显著提高土壤中磷酸酶的活性,所有浓度处理对土壤脲酶活性均无显著影响。（3）中、高浓度的棉花根系分泌物能显著增加土壤中细菌的数量,低浓度的分泌物能显著增加土壤中真菌的数量,而不同浓度处理的土壤中放线菌的数量均无显著的变化。研究表明,棉花根系分泌物可通过促进土壤细菌及土壤真菌的繁殖来增强土壤转化酶和磷酸酶活性,提高土壤速效P、速效K及速效N含量,从而对棉花根际微环境产生深刻影响。
Cotton seedlings were cultured in hydroponics,root exudates were collected by concentrating the deionized water,in which the cotton seedlings transferring to. Collected root exudates were subjected to the soil with cotton cultivation for one year. Soil available nutrition contents, enzyme activities and microorganism quantity were determined after ten days incubation of treated soil. The results showed that the root exudates of cotton can significantly enhance the contents of the available K and available P in soil. In three treatments,soil available P significantly increased by 5. 99% ,13.14% and 24.31% （P〈0.01）and available K significantly elevated by 4.31%,8.26% and 15. 03% （P〈0.01）. Only higher input of cotton root exudates improved the content of the available N by 11.39% （P〈0.05） in soil. And any influence was observed in soil organic matter in all treatments. The exudates could enhance the activity of the invertase in soil,and which was increasing along with the raising input. Low concentrations of exudates could enhance the activity of the alkaline phosphatase in soil, but all treatments had no effects on the activity of urease.Higher and medial input of cotton root exudates could increase the quantity ot bacteria xn soil, lOW aClOltlon could increase the quantity of fungi,and the quantity of actinomycetes had no obvious changes in all treat- ments. Conclusively, the root exudates of cotton could stimulate the proliferation of soil bacterial and fungi, enhance the activities of inverase and alkaline phosphatase,increase the pool of available P and available K and available N,which imposed a prominent influence on cotton rhizospheric microcosm.
出处
《西北植物学报》
CAS
CSCD
北大核心
2009年第7期1426-1431,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家“973”计划前期研究专项(2007CB116303)
新疆生产建设兵团基础研究项目(2007JC06)资助
关键词
棉花
根系分泌物
土壤养分
酶活性
微生物数量
cotton
root exudates
soil nutrition
enzyme activity
microorganism quantity
