A 40-day gnotobiotic microcosm experiment was carried out to quantify the effect of hastenal-feeding nematode on plant growth and nutrient absorption. The results showed that inoculation of bacterial-feeding nematode ...A 40-day gnotobiotic microcosm experiment was carried out to quantify the effect of hastenal-feeding nematode on plant growth and nutrient absorption. The results showed that inoculation of bacterial-feeding nematode Protorhabditis sp. stimulated the growth of wheat (Triticum aestivum) and the uptake of N. By the end of the 40-day incubation wheat biomass and N uptake in the treatment with nematode and bacteria (Pseudomonas sp.) increased by 6.5% and 5.9%, respectively, compared with bacteria alone treatment. The presence of nematode mainly accelerated the growth of aboveground of wheat, while it slightly inhibited the root development. There was little difference in plant tissue N concentration between treatments. P concentration and uptake of wheat, however, were generally reduced by nematode. It appears that the enhancement of plant growth and nitrogen uptake is attributed to the enhancement of nitrogen mineralization induced by nematode feeding on bacteria, and the reduction of phosphorous uptake is the result of weak root status and competition by bacteria immobilization.展开更多
The earthworms Pheretima carnosa,Drawida gisti and Eisenia foetida were studied to compare their contributions to the decomposition of various organic materials surface-applied on red soil in a 165-day greenhouse expe...The earthworms Pheretima carnosa,Drawida gisti and Eisenia foetida were studied to compare their contributions to the decomposition of various organic materials surface-applied on red soil in a 165-day greenhouse experiment.The native species Pheretima carnosa and Drawida gisti were equally effective in accelerating the decomposition of maize residue,according to fresh body weight,while commercial species Eisenia foetida had no significant influence on dry mass loss of maize residue,Liming with CaCO3 or CaO showed little effect on maize residue breakdown involved by Pheretima carnosa,but it inhibited this process involved by drawida gisti,The capability of Pheretima carnosa to the decompostition of five kinds of organic materials was thoroughly examined.The dry mass losses in worm treatments were in the order of soybean residue>maize residue>pig manure>semi-decayed maize>ryegrass.however,the relative contributions of the earthworm to dry mass loss were in the order of pig manure(89.8%)>semi-decayed maize residue (49.1%)>maize residue(29.4%)>soybean residue(20.9%)>ryegrass residue(16.5%),Pheretima carnosa consumed 20-120mg dry weight of organic material per gram fresh weight of biomass per day.展开更多
基金Project (No. 39570134 and 39970419) supported by the National Natural Science Foundation of China.
文摘A 40-day gnotobiotic microcosm experiment was carried out to quantify the effect of hastenal-feeding nematode on plant growth and nutrient absorption. The results showed that inoculation of bacterial-feeding nematode Protorhabditis sp. stimulated the growth of wheat (Triticum aestivum) and the uptake of N. By the end of the 40-day incubation wheat biomass and N uptake in the treatment with nematode and bacteria (Pseudomonas sp.) increased by 6.5% and 5.9%, respectively, compared with bacteria alone treatment. The presence of nematode mainly accelerated the growth of aboveground of wheat, while it slightly inhibited the root development. There was little difference in plant tissue N concentration between treatments. P concentration and uptake of wheat, however, were generally reduced by nematode. It appears that the enhancement of plant growth and nitrogen uptake is attributed to the enhancement of nitrogen mineralization induced by nematode feeding on bacteria, and the reduction of phosphorous uptake is the result of weak root status and competition by bacteria immobilization.
文摘The earthworms Pheretima carnosa,Drawida gisti and Eisenia foetida were studied to compare their contributions to the decomposition of various organic materials surface-applied on red soil in a 165-day greenhouse experiment.The native species Pheretima carnosa and Drawida gisti were equally effective in accelerating the decomposition of maize residue,according to fresh body weight,while commercial species Eisenia foetida had no significant influence on dry mass loss of maize residue,Liming with CaCO3 or CaO showed little effect on maize residue breakdown involved by Pheretima carnosa,but it inhibited this process involved by drawida gisti,The capability of Pheretima carnosa to the decompostition of five kinds of organic materials was thoroughly examined.The dry mass losses in worm treatments were in the order of soybean residue>maize residue>pig manure>semi-decayed maize>ryegrass.however,the relative contributions of the earthworm to dry mass loss were in the order of pig manure(89.8%)>semi-decayed maize residue (49.1%)>maize residue(29.4%)>soybean residue(20.9%)>ryegrass residue(16.5%),Pheretima carnosa consumed 20-120mg dry weight of organic material per gram fresh weight of biomass per day.
