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【Objective】Through the comparison of models, the present paper aimed to explore the influence of ’chninese milk vent Returning to the Field coupled with rice and fish symbiosis’ on the soil nutrients and yield of rice, and provided a scientific basis for efficient and high-quality rice production and sustainable development.【Method】In this experiment, four treatments including conventional rice planting as a control(CK), chninese milk vent Returning to the Field(ZD), rice and fish symbiosis(YD),chninese milk vent Returning to the Field coupled with rice and fish symbiosis(ZY), measuring, analysis and comparison of the contents of soil nutrients(organic matter,total nitrogen, total phosphorus,total potassium and their effective state), rice yield and yield component index of each treatment were performed.【Result】Compared with CK, YD, ZD and ZY can effectively improve the soil fertility of rice in the current season, and ZY has the best effect. Compared with CK, soil organic matter, total nitrogen, total phosphorus, total potassium and their effective state content of ZY mature period were increased by 16.40 %, 18.18 %, 20.63 %, 3.42 %, 7.71 %, 15.96 % and 1.85 %(P<0.05); ZD can effectively alleviate soil acidification, and the soil pH at maturity was 6.06,which compared with CK, YD and ZY, it increased by 0.04, 0.12 and 0.08 units, and the difference was significant(P <0.05);Compared with CK,ZY, ZD, and YD can increase the yield of rice in the season effectively, and ZY has the highest yield of rice, reaching 6.29 t/hm~2. Compared with CK, ZD and YD, the actual yield of ZY increased by 4.83 %-11.33 %,and the difference was significant(P <0.05).【Conclusion】In summary, chinese milk vent returning to the field coupled with rice and fish symbiosis can effectively improve soil fertility and significantly increase rice production in the current season, which was an greenand efficient way of fertilizing. [ABSTRACT FROM AUTHOR]

【Objective】 The present paper aimed to find out the soil nutrients characteristics of spatial distribution in the roots of Haloxylon ammodendron in the southern margin of the Gurbantunggut Desert.【Method】The 149-Regimen,Ganjiahu Nature Reserve and the H.ammodendron in the desert area around the Karamay Agricultural Technology Development Zone were taken as examples,The spatial distribution and characteristics of pH,electrical conductivity,water content,organic matter and available phosphorus in the roots of H.ammodendron were quantitatively studied by a combination of field survey sampling and laboratory test analysis.【Result】In different areas,the soil water content and soil pH of the root ofH.ammodendron were mainly near the main root the middle of the crown>the edge of the crown,and the difference was significant(P <0.05); The organic matter content decreased with the depth of the soil layer; The soil available phosphorus content and the soil electrical conductivity were generally in the middle of the crown > near the main root > the crown edge,which generally decreases with the increase of soil depth.【Conclusion】There was a ‘fat island’ effect in the root zone of H.ammodendron in different regions,and the maximum concentration range in 0-40 cm soil layer. [ABSTRACT FROM AUTHOR]

[Objective】 The objective of the paper is to explore the response mechanismof soil nutrients in economic fruit woodland to different intercropping and mono-cropping patterns in rocky desertification control area and to provide the scientific basis for vegetation optimization and soil nutrient supply of economic fruit woodland (Rosa roxburgMi and Juglans reiiia) in rocky desertification control area. ' Method】 The resjDonse of soil nutrients in economic fruit woodland to cropping patems in rocky desertification control area was stiadied by single-factor vari¬ance ，factor and sort-l)ased analysis combined witli fiel(d sampling and conventional soil nutrient analysis. ' Result】 The content of soil nutri¬ents showed a decreasing trend but soil pHincreased with increase of soil depth. Total N，total P，available P and available K content in soil withi diferent depth under Rosa roxburghii-Juglans reigia intercropping patem were higher than that under Rosa roxburghii mono-cropping pattern significantly (%<0. 05) . Total Kand available N content of soil with different depth under Roa rxburg"i mono-cropping pattern were higher thian that under Rosa roxburghii-Juglans reigia intercropping patern significantly (% <0. 05). Organic matter content of soil with 0-10 cm depth under Rosa roxburghii-Juglans reigia intercropping patern was higher than that under Rosa roxburghii mono-cropping patern but organic matter content of soil with > 10 cm depth under Rosa roxburghii-Juglans reigia intercropping patern was lower than that under Rosa roxburghii mono-cropping patem signiicantly (% <0. 05). The soil nutrient supply level under Rosa roxburghii-Juglans reigia inter¬ cropping patem (0.572) was higher thian under Rosa roxburghii mono-cropping patern (0. 439). Total K，organic matter，available N available K were main factors influencing soil nutrient supply level in the research area. ' Conclusion 】The response of soil nutrients in economic friait woodland to intercropping and mono¬cropping patems is sensitive in rocky desertification control area. The Rosa roxburghii-Juglans re^gia intercropping pattern and Roa roburghh mono-cropping pattern can consolidate and maintain the supply level of soil nutrient content in intercrop¬ping woodland and supplement soil nutrients in mono-cropping woodland for improving its supply level. [ABSTRACT FROM AUTHOR]

[Objective] The aim of this paper is to fully understand the temporal and spatial variation of soil nutrient in the cultivated land in Kunming district. [Method] Based on the analysis of 3907 farmland soil samples collected from 7 counties in Dianehi district of Kunming city, combined with ‘3S’ technology, the spatial distribution and change of soil nutrient content of farmland in Kunming city were studied. [Result] The results showed that the area with medium available boron content in the cultivated land in Dianehi district of Kunming city accounted for 70.08%, and the area with deficient available boron content accounted for 28.29%. The area with medium available zinc content accounted for 63.18% . Most areas of other nutrients were rich or more abundant. According to the average value of soil nutrient, the total nitrogen and alkali hvdrolysable nitrogen in the Dianehi district of Kunming city reached a rich level, while the organic matter, available phosphorus and available potassium were rich. Except for available boron, the average contents of effective manganese, effective zinc and effective molybdenum of trace elements were in high or higher level. The nutrient contents of vegetable land and seasonal vegetable land were higher than that of the dry land of fruit trees. [Conclusion]The total nutrient content of arable soil in Dianehi district of Kunming city is rich. Compared with the second national soil survey data, the contents of soil organic matter, total nitrogen, alkali hvdrolysable nitrogen, a-vailable phosphorus and available potassium are generally increasing. In the process of fertilization, it is necessary to combine the technology of improving the soil quality of cultivated land to achieve precise fertilization, and improve the utilization rale of fertilizer and the ability of soil fertilizer supply. [ABSTRACT FROM AUTHOR]

[Objective]The aim of this paper was to explore the distribution characteristics of soil nutrients in different recovery modes of rocky desertification control, and to provide scientific basis for further optimizing the vegetation allocation of rocky desertification control. [Method] Taking soil from five sampling sites as the study object, including Zanthoxylum bungeanum, Lonicera japonica, mixed forests, cardamom and abandoned farmland in Huajiang Rocky Desertification Control Demonstration Area in Guizhou. Soil layers of 0 - 10, 10 -20 and 20 -30 cm were sampled and monitored for 3 years before, during and after rainy season, and the distribution characteristics of soil nutrients under different recovery modes were analyzed. [Result] With the restoration of vegetation, compared with abandoned farmland, average values of soil bulk density, soil retention ability and capillary porosity in the four plots decreased respectively by 0.61 %, 7.97 % and 1.12 % , soil organic carbon, total nitrogen, total phosphorus and total potassium increased by 53.45 %, 45.72 %, 80.81 % and 1.44 % respectively, hydrolyzed nitrogen and available phosphorus increased by 53.36 % and 25.80 % , respectively. In the same plot, the contents of soil organic matter and soil nutrient contents were all shown as during rainy season > after rainy season > before rainy season. With the increase of depth of the soil layer, content of soil nutrients of different recovery models decreased, nutrients mainly concentrated in the surface layer. [Conclusion] There were differences in nutrient contents between different restoration models, and vegetation restoration in karst rocky desertification area had an ameliorative effect on ecological environment. [ABSTRACT FROM AUTHOR]