The Influence Of Different Site Conditions And Different Management Measures On Soil Ferility In Woodland Of Torreya Grandis Cv.Merrillii

Torreya grandis cv.Merrillii,is a general term that describes the excellent natural variation types of Torreya grandis,a cultivation group which through artificial breeding selection and grafting,also a rare specialty dried fruit in China.This paper analysis the influence of different site conditions and different management measures on soil ferility in woodland of Torreya grandis cv.Merrillii,for providing theory basis to solve the problems of the management process.The main results were as follows:1.Soil sampled from the granite and limestone parent rocks had higher organic matter,52.22 g·kg^-1.Sandy shale had the lowest organic matter,25.27 g·kg^-1.Soil p H level has larger inheritance to the parent rock,Different parent rocks development of woodland soils there are many differences between the soil pH in the range 5.0-6.0.There are significantly different degree of difference in different parent rocks development of soils available nitrogen,available phosphorous,available potassium content,and there are positive correlation between organic matter content.But the soil pH value had a negative correlation relationship between some available nutrients.2.Woodland soil fertility of Torreya grandis cv.Merrillii under different management years had obvious differences.Variation in surface soil organic matter is large,maintaining at a high level as a whole,the highest content of 6 years for 62.22 g·kg^-1.Woodland presents the acidification trend of soil along with the increasing length of run.Available nitrogen content all keep at a high level.Has also been available phosphorus enrichment,the lower levels were low.Available potassium content had no obvious accumulation with management years of the extension.3.Torreya grandis cv.Merrillii woodland soil organic matter content increased with the decline of slope positions under the condition of different slope positions,the organic matter content the north slope is significantly higher than the south slope.Different slope positions had little effect on soil pH value,but also be reduced with the increase of slope positions.The downward trend with the increase of slope positions of available nitrogen content is significant.Available phosphorus in different broken bits produced obvious differences,content also roughly fall with the increase of slope positions.Available potassium content also presented the downward trend with the increase of slope positions.The impact of soil total nitrogen content under different slope positions varies with the difference of slope aspect to the law of the present different change.The content of total phosphorus is low in high slope,138.96 mg·kg^-1and relatively low slope content is higher.Total potassium content varied with the change of slope positions did not show obvious change rule.Heavy metal Cu content presented the increasing trend with falling slope positions.4.There were different distribution characteristics of soil fertility in Torreya grandis cv.Merrillii on microhabitat distribution and redistribution slope.Soil organic matter,alkali-hydro nitrogen and available potassium content in the clean-tillage woodland showed less outward along the trunk in the horizontal direction.But there was no significant difference in soil organic matter,alkali-hydro nitrogen and available potassium along the trunk in the herbage interplanting woodland.Effective phosphorus content in horizontal direction difference reached significant level,soil pH was without obvious changing rule;Organic matter and available nutrient content under different cultivating systems decreased with soil depth in vertical direction,but the pH was bigger.On the slope re-distribution,soil fertility varied with different management measures,for example,Soil organic matter,alkali-hydro nitrogen and available potassium content: the downhill bits> middle slope> upper slope under clean tillage treatment,the middle slope > downhill bit > upper slope under herbage interplanting.Effective phosphorus presented no significant difference of distribution characteristics on the slope re-distribution,the soil pH decreased with the increase of slope positions.5.Different fertilizer treatments were significantly improved the content of Torreya grandis cv.Merrillii woodland soil organic matter,of which the most apparent is compound fertilizer and organic fertilizer application,31.02 g·kg^-1.The influence on the soil pH value was not significant.The difference between available nitrogen content under different fertilization measures both reached significant level,with compound fertilizer and organic fertilizer with increase of soil available nitrogen effect is most obvious,165.51 mg·kg^-1.Increasing the content of available phosphorous in soil with organic fertilization measure is the most significant,43.77 mg·kg^-1.The difference between available potassium content under different fertilization measures not reached significant level,all kinds of fertilizer treatments can very good supplement soil available potassium content.