Using woody organic matter amendments to increase water availability and jump‐start soil restoration of desertified grassland soils of Ningxia, China

Land Degradation and Development - Tập 30 Số 11 - Trang 1313-1324 - 2019
Zhigang Li1, Rebecca L. Schneider2, Stephen J. Morreale2, Yingzhong Xie1, Jian Li3, Changxiao Li4, Xilu Ni3
1School of Agriculture, Ningxia University, Yinchuan 750021,PR China
2Department of Natural Resources Cornell University Ithaca NY 14886 USA
3State Key Laboratory of the Seedling Bioengineering Ningxia Forestry Institute Yinchuan 750004 PR China
4Key Laboratory for the Eco-Environment of the Three Gorges Reservoir Region of the Ministry of Education, College of Life Sciences Southwest University Chongqing 400715 PR China

Tóm tắt

AbstractSolutions are urgently needed to address the continued degradation of agricultural soils worldwide, which has severely impacted the ability to grow crops and has led to increased irrigation demand from already rapidly depleting freshwater resources. This project evaluated a unique, previously untested, type of soil organic amendment, that is, coarse wood chips, for capturing and storing scarce precipitation and improving desertified, sandy soils. A field plot experiment was conducted in Ningxia, China, from 2011 through 2016, comparing unamended sandy soils with three coarse woody amendments, including (a) surface‐applied mulch, (b) wood chips incorporated into the top 20 cm of soil, and 3) incorporated wood chips combined with a branch lattice shelter over the soil surface—all treatments replicated under both irrigated and nonirrigated conditions. Precipitation patterns and soil moisture content were compared between 2012 and 2015, and related soil physical and chemical properties were monitored continuously, as well as alfalfa yields in 2015 and 2016. Results indicated that amended soils maintained significantly higher soil water contents between rain events, decreased the number of days below the permanent wilting point, and improved soil properties and alfalfa growth. The combination treatment of wood chips and a branch shelter performed the best among treatments, exhibiting increases in average water storage 50% or more above controls. Unlike highly degradable soil amendments, the slow decomposition of the coarse wood chips resulted in continuous benefits for all 5 years. This use of coarse wood chips represents a timely new addition to the toolbox of soil amendments, providing a mechanism for immediate, long‐lasting restoration of the world's degraded and desertified soils that will foster global food and water security.

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Thông tin xuất bản

Land Degradation and Development

Tập 30 Số 11

1313-1324

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