Abstract：
:Chinese greenhouse vegetable production can cause eutrophication of fresh waters due to heavy use of fertilizers. To address this, phosphorus (P) leaching was compared between two major greenhouse vegetable soils from Jiangsu Province, Southeast China: clayey and acid-neutral Guli Orthic Anthrosols and sandy and alkaline Tongshan Ustic Cambosols. A total of 20 intact soil columns were collected based on differences in total P content varying between 1360 and 11,220 mg kg-1. Overall, six leaching experiments were carried out with collection of leachates over 24 h. Very high P concentrations, with a mean of 3.43 mg L-1, were found in the leachates from P rich Tongshan soils. In contrast, P leaching from fine-textured but less P rich Guli soils rarely exceeded the suggested environmental P threshold of 0.1 mg L-1. Strong linear correlations were found between different soil test P measures (STPs) or degree of P saturations (DPSs) and dissolved reactive P (DRP) for Tongshan soil columns. The correlations with Olsen P (r2 = 0.91) and DPS based on MehlichIII extractable calcium (DPSM3-Ca) (r2 = 0.87) were the most promising. An Olsen P value above 41 mg kg-1 or a DPSM3-Ca above 3.44% led to DRP leaching exceeding 0.1 mg L-1. Accordingly, more than 80% of Tongshan soils resulted in DRP leaching exceeding the environmental P threshold. In conclusion P rich alkaline sandy soils used for greenhouse vegetable production are at high risk of P mobilization across China.
journal_name
Chemospherejournal_title
Chemosphereauthors
Kalkhajeh YK,Huang B,Hu W,Holm PE,Bruun Hansen HCdoi
10.1016/j.chemosphere.2016.12.147subject
Has Abstractpub_date
2017-04-01 00:00:00pages
316-324eissn
0045-6535issn
1879-1298pii
S0045-6535(16)31891-4journal_volume
172pub_type
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