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RESEARCH ARTICLE

Importance of adding woodchips to local amendments for improving soil health and increasing yield in severely degraded soils of Northern China

Zhigang Li https://orcid.org/0000-0003-3747-9361 A F , Yingzhong Xie A , Rebecca L. Schneider B , Stephen J. Morreale B , Xiaoyan Bo C , Xilu Ni D and Changxiao Li E
+ Author Affiliations
- Author Affiliations

A School of Agriculture, Ningxia University, Yinchuan, Ningxia 750021 China.

B Department of Nature Resources, College of Agriculture and Life Sciences, Cornell University, Ithaca, NY 14886 USA.

C College of Resources and Environmental Science, Institute of Environmental Engineering, Ningxia University, Yinchuan, Ningxia 750021 China.

D Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of North-western China, Key Lab for Restoration and Reconstruction of Degraded Ecosystem in North-western China of Ministry of Education, Ningxia University, Yinchuan, Ningxia 750021 China.

E Key Laboratory for the Eco-Environment of the Three Gorges Reservoir Region of the Ministry of Education, College of Life Sciences, Southwest University, Chongqing 400715 China.

F Corresponding author. Email: lizg001@sina.com

Soil Research 58(5) 478-487 https://doi.org/10.1071/SR19121
Submitted: 15 May 2019  Accepted: 10 March 2020   Published: 20 April 2020

Abstract

Wood chips, together with crop straw and manure, were demonstrated as feasible amendments for improving overall soil health and enhancing plant growth in severely desertified areas in Northern China in our previous studies. However, the effects of their mixtures are unclear. In this study, we evaluated the effect of three different amendment materials, when used alone and in combination, on physical, chemical, and biological properties of desertified soil and on the associated growth of alfalfa in Ningxia, Northern China. Four replicate microcosms were set up containing sandy soil mixed with 3% (w/w) of each of the following treatments: cow manure (CM), corn straw (CS), and poplar branches (PB) and their mixtures CS-PB, CM-PB, CM-CS, and CM-CS-PB. Measurements were conducted 7 and 15 months after the start of the experiment. Results showed, as a whole, treatment CS-PB improved soil physical properties more than other amendments during the whole experimental period, compared with control. However, the best establishment of alfalfa in the first year and best growth in the second year occurred in the CM-CS-PB treatment. Moreover, available N and urease were the most important driving factors affecting alfalfa growth during the whole experimental period, as shown by redundancy analysis. However, interestingly, the CM-CS-PB also functioned better in maintaining N supply and accelerating microbial activity than the other amendments. Therefore, we concluded that wood chips have a unique advantage in improving overall soil health and alfalfa growth when combined with straw and manure as new amendments.

Additional keywords: corn straw, cow manure, desertified soil, organic amendments, poplar branches.


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