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Scientia Silvae Sinicae ›› 2016, Vol. 52 ›› Issue (7): 1-12.doi: 10.11707/j.1001-7488.20160701

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Spatial-Temporal Variation of Soil Fertility in Chinese Walnut (Carya cathayensis) Plantation

Shen Yifan1, Qian Jinfang2, Zheng Xiaoping3, Yuan Ziqian4, Huang Jianqin1, Wen Guosheng1, Wu Jiasen1   

  1. 1. The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University Lin'an 311300;
    2. Changxing Timber Inspection Station, Zhejiang Province Changxing 313100;
    3. Lin'an Forestry Bureau, Zhejiang Province Lin'an 311300;
    4. Hangzhou Academy of Forestry, Zhejiang Province Hangzhou 310016
  • Received:2015-05-25 Revised:2016-06-01 Online:2016-07-25 Published:2016-08-16

Abstract: [Objective] Chinese walnut (Carya cathayensis) is a nut and oil tree species endemic to China. It is important to study the spatial-temporal variation of soil fertility for soil management of Chinese walnut plantations.[Method] Soil samples were collected (317 in 2008, and 239 in 2013, respectively) from Chinese walnut plantations in Lin'an, Zhejiang Province. Spatial-temporal variation of soil pH value, organic carbon, hydrolytic N, available P, and K were investigated by using techniques of geostatistics and GIS.[Result] From 2008 to 2013, the average contents of hydrolytic N and available K in the soils significantly decreased by 19.4 and 55.6 mg·kg-1 respectively. The average pH values decreased from 5.5 to 5.3, and the average organic carbon contents decreased by 0.2 g·kg-1. However, the content of available P increased by 0.5 mg·kg-1. Standard deviations of the 5 soil variables were small, indicating a weak variation of the data. From 2008 to 2013, the spatial autocorrelations of pH, hydrolytic N and available P were weaker, and auto-correlation distances were shorter. But the continuity of spatial distribution of organic carbon and available K was obvious and their corresponding auto-correlation distances increased; Elevations, parent rocks and managements in different townships significantly affected soil pH values and contents of both hydrolytic N and available K (P<0.1). Different elevations and management in different townships also had a significant impact on organic carbon (P<0.1), but only management in different townships had a significant impact on available P(P<0.1). The content of soil organic carbon, hydrolytic N, available P and K largely decreased in Daoshi, while soil pH value decreased in Qingliangfeng and Daoshi towns.[Conclusion] From 2008 to 2013, the overall soil fertility of Chinese walnut plantations in Lin'an declined. We suggest extend a soil test-based fertilizer application in the process of production and management of Chinese walnut, and to increase soil fertility by liming, growing grasses on the top soil and ecologically friendly fruit harvesting.

Key words: Chinese walnut (Carya cathayensis), soil pH value, soil organic carbon, soil hydrolytic N, soil available P, soil available K, spatial-temporal variation

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