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细根对植物功能的发挥和土壤碳库及全球碳循环具有重要意义。采用容器法和微根管法于2013年6~10月整个生长季内对紫花苜蓿的细根生物量、生产以及周转规律进行研究。结果表明:(1)紫花苜蓿活细根现存生物量平均值以接种摩西球囊霉(Gm)处理最高(12.46g·m-2),未接种对照最低(7.31g·m-2),并且活细根现存量在9月中旬达到峰值;死细根现存生物量呈先增加后降低再增加的变化趋势,在整个生长过程中未接种处理高于接种处理,接种根内球囊霉(Gi)处理死细根现存平均生物量(3.11g·m-2)又较接种组其他处理低。(2)苜蓿植株细根生长量以接种幼套球囊霉(Ge)处理最大(0.045 mm·cm-2·d-1),接种Gm处理和未接种对照最低(均为0.027mm·cm-2·d-1);而未接菌植株细根死亡量(0.044mm·cm-2·d-1)显著高于接种植株,接种组又以Gi处理最低(0.021mm·cm-2·d-1)。(3)紫花苜蓿在生长季节内细根生产和死亡的高峰分别出现在8月底和10月份,低谷出现在9月底到10月中旬和6月底到8月;接种地表球囊霉(Gv)后细根现存量和年生长量显著高于对照和接种其他菌种处理,细根的周转以对照组最大,而接种Gv和Gm处理较低。研究发现,通过接种丛植菌根真菌可以提高苜蓿细根生物量,降低细根的死亡,增加细根寿命。
Fine roots play an important role in plant function and soil carbon pool and the global carbon cycle. The fine root biomass, production and turnover rule of alfalfa were studied by container method and micro-root canal method from June to October in 2013. The results showed as follows: (1) The average biomass of live fine root of alfalfa was the highest (12.46 g · m-2) inoculated with Gm and the lowest in un-inoculated control (7.31 g · m-2) The existing stock of living fine root reached the peak in the middle of September. The existing biomass of dead fine root increased firstly, then decreased and then increased. The uninoculated treatment was higher than inoculation during the whole growth period, ) The average biomass of dead fine roots (3.11g · m-2) was lower than other treatments in the inoculation group. (2) The root growth of alfalfa plants was the highest (0.045 mm · cm-2 · d-1) when inoculated with Ge, and the lowest (0.027 mm · cm- 2 · d-1). However, the rate of death of fine roots (0.044mm · cm-2 · d-1) in un-inoculated plants was significantly higher than that in inoculated plants and the lowest in inoculated groups (0.021mm · cm-2 · d -1). (3) The peak of fine root production and death of alfalfa appeared in the end of August and October in the growing season, while the lowest appeared in the end of September to the middle of October and the end of June to August. After inoculation of Gv The fine root present and annual growth were significantly higher than the control and inoculated with other strains, and the fine root turnover was the largest in the control group while the Gv and Gm inoculation was lower. The study found that by inoculation of pine mycorrhizal fungi can increase alfalfa fine root biomass, reduce the death of fine roots and increase the fine root life.