Land-use changes from arable crop to kiwi-orchard increased nutrient surpluses and accumulation in soils

Lu, Yongli and Chen, Zhujun and Kang, Tingting and Bellarby, Jessica and Zhou, Jianbin (2016) Land-use changes from arable crop to kiwi-orchard increased nutrient surpluses and accumulation in soils. Agriculture, Ecosystems and Environment, 223. pp. 270-277. ISSN 0167-8809

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Abstract

The potential environmental risk associated to nutrient surpluses after changing arable crops to kiwi-orchards was assessed in the Yujiahe catchment of Shaanxi, China. This was achieved by surveying 242 kiwi-orchards and 21 croplands and determining their nutrient inputs and outputs as well as the soil nutrient status for the over 2 years. The total inputs of nitrogen (N), phosphorus (P) and potassium (K) from fertilizers, manures, deposition, and irrigation in kiwi-orchards were 1201, 268 and 615 kg ha−1 yr−1, respectively, which were higher than the rates of 425, 59 and 109 kg ha−1 yr−1 in wheat-maize fields. The mean annual apparent nutrient surpluses in kiwi-orchards were 1081 kg N ha−1 yr−1, 237 kg P ha−1 yr−1 and 491 kg K ha−1 yr−1. Within comparison to the croplands, the soil organic matter (SOM) and total N (TN) in the topsoil (0–20 cm) increased in kiwi-orchards, and soil pH decreased. The average contents of Olsen-P, and available K in 0–20 cm soils of the orchards were 86 mg kg−1, and 360 mg kg−1, which were higher than recommended levels. The nitrate-N accumulation in the 0–100 cm and 0–200 cm soil layers in kiwi-orchards were 466 and 793 kg N ha−1, respectively. The high proportion of nitrate-N in deeper soil profiles of kiwi-orchards poses a great risk for nitrate leaching and subsequent ground water pollution. It is concluded that changing arable crops to kiwi-orchards increased the environmental burden of the catchment due to excessive fertilizer application in kiwi-orchards.

Item Type:
Journal Article
Journal or Publication Title:
Agriculture, Ecosystems and Environment
Additional Information:
This is the author’s version of a work that was accepted for publication in Agriculture, Ecosystems and Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Agriculture, Ecosystems and Environment, 223, 2016 DOI: 10.1016/j.agee.2016.03.019
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100/1102
Subjects:
ID Code:
78850
Deposited By:
Deposited On:
06 Apr 2016 12:10
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 03:52