|Table of Contents|

Effects of isolation cushion type on the soil nutrient dynamics and growth of Salix babylonica on saline-alkali land in Ningxia, China

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2018 05
Page:
1152-1157
Research Field:
Articles
Publishing date:

Info

Title:
Effects of isolation cushion type on the soil nutrient dynamics and growth of Salix babylonica on saline-alkali land in Ningxia, China
Author(s):
HE Xinyan1 QIAO Xuetao1 ZHAO Haiyan1 HE Jun2 SUN Zhaojun2 & ZHAO Xiuhai1**
1 Key Laboratory for Forest Resources & Ecosystem Processes of Beijing, Beijing Forestry University, Beijing 100083, China 2 Development Center of New Technique Application and Research, Ningxia University, Yinchuan 750021, China
Keywords:
saline-alkali land isolation cushion corn stalk yellow sand coal fly ash electrical conductivity soil pH Salix babylonica
CLC:
S156.49
PACS:
DOI:
10.19675/j.cnki.1006-687x.2017.10002
DocumentCode:

Abstract:
Large areas of saline-alkali land occur in Ningxia, China. However, since the rate of utilization of such land by humans is low, the use of local land resources is also restricted in these areas. Therefore, it is important to improve the management of saline-alkali land. This study was done at a site located in Wuzhong, Ningxia province. Corn stalk (JG), yellow sand (HS), and fly ash (FM) were applied to form isolation cushions, which were applied at thicknesses of 15 cm and laid at the bottom of tree pits. Changes in soil pH and electrical conductivity (EC) were measured in July, August, and October in 2016, and their dynamics were then analyzed. Soil total nitrogen, phosphorus, and potassium content, as well as tree height, diameter at breast height (DBH), length of new branches, and crown growth volume, were measured in October and September, respectively. The results showed that JG significantly reduced the pH of the soil by 5.85% in the 40-80 cm layer from July to October, while such a significant reduction in soil PH did not occur in the areas treated with HS and FM. Moreover, the EC value of the soil significantly decreased in all treatments in the 0-20 cm layer (by 65% with JG, 68.7% with HS, and 60% with FM from July to October). Furthermore, JG also reduced the EC value in the 60-80 cm layer, while HS reduced the EC value in the 40-80 cm layer. In addition, the highest soil total nitrogen and phosphorus content occurred in the JG and FM treatments, respectively, which were 8% and 19.48% higher than those in the control group. The JG treatment significantly increased the total nitrogen content in the 60-80 cm layer, while the FM treatment significantly increased the total phosphorus content in the 40-60 cm layer; however, the HS treatment did not significantly increase the content of any nutrient in the soil. Based on a principal component analysis of growth factors (DBH, tree height, length of new branches, and crown width) of Salix babylonica, the JG treatment was found to have performed better at improving the soil than the other two treatments. In summary, the treatment with a JG isolation cushion is likely the best solution that should be used to improve the saline-alkali land in Ningxia.

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Last Update: 2018-10-25