Fifteen kinds of representative typical Paddy ecosystem pattern in central Hunan were comprehensive evaluation by weighted exponential method, and their energy utilization, nutrient equilibrium and economic benefit were analyzed by citing the former research production and inspecting in doors.
Twelve kinds of representative typical rice paddy ecosystem in Hunan were comprehensive evaluation by weight exponential method, and their energy, nutrient equilibrium and economic effects were analyzed by inciting the former research production and inspecting in doors.
On the bases, fourteen kinds of representative typical paddy ecosystem pattern in Changsha city were comparatively evaluated by weighed exponential method, and their energy utilization, nutrient equilibrium and economic benefit were analyzed by citing the former research production and inspecting in doors.
Nutrient equilibrium of the soil and its changes controlled nutrient gain or loss in the farmland The correlation coefficient of the model between gain and loss of available phosphorus and of total phosphorus is Y =2 895+0 134 X , the correlation coefficient of the model between gain and loss of readily available potassium and of total potassium is Y=18 81+0 163X .
The nitrogen fertilizer was usually used two or three times with the ratio of 20:30: 50, but the equitable ratio was 20:70:10. The nutrient equilibrium was lost with nitrogen excessively and potassium scarcely.
Trace elements such as Ca, Fe, Cu, Mg, Mn, Zn, Mo contained in FFR are the same as that in fruit, so utilization of FFR for long period can keep good nutrient equilibrium in soil. Wen using compound fertilizer composed of FFR and chemical fertilizer, amounts of some elements in fruit are lower than that when using other kinds of fertilizer. It may be caused by flocculent and the production process of compound fertilizer.
Finally, the authors suggest that, by regulating the nutrient equilibrium and controlling the sources and transporting paths of lipid, it may be possible to prevent and cure the fatty liver.
Ecosystem models and relative softwares have evolved from simple regression models,single nutrient equilibrium models to complexeco-stucture dynamic models.
The perturbation of the Michaelis-Menten mechanism which determines the nutrient-dependent growth rate of the phytoplankton species leads to higher catastrophes for the nutrient equilibrium manifold.
Test result of fermentation effluent (FE) and flocculated fermentation residue (FFR) of pig manure on cucumber shows that efficiency of FFR used as basal dressing is better than that of chemical fertilizer with the same quantity of N, P, K; efficiency of FE used as dressing is obviously lower than that of chemical fertilizer with the same quantity of N. Trace elements such as Ca, Fe, Cu, Mg, Mn, Zn, Mo contained in FFR are the same as that in fruit, so utilization of FFR for long period can keep good nut...
Field experiments and laboratorial work were carried out to understand the nutrient cycling patterns in tussah - feeding oak plantation and the effect of disturbance on nutrient equilibrium. The results show that larger proportion of nutrient is stored in root and more nutrients can transfer from leaf to stem. The cocoon is the main form of the secondary productivity of tussah-feeding oak plantation. Its nutrient output level has a greater effect on the internal nutrie...
Advance in interpretation of analytic results from foliar nutrient diagno- sis of forest tree was reviewed and limitation of evaluating nutrient status through nu- trient content was pointed out,DRIS method based on nutrient equilibrium theory was introduced,and application of diagnosis method ,which considers leaf weight and nutri- ent,content,in foliar nutrient diagnosis,of forest tree was introduced,too.