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Lime Application Affects Soil Cadmium Availability and Microbial Community Composition in Different Soils
Author(s) -
Shangguan Yuxian,
Qin Yusheng,
Yu Hua,
Chen Kun,
Wei Yuan,
Zeng Xiangzhong,
Zhou Zijun,
Guo Song,
He Siyi
Publication year - 2019
Publication title -
clean – soil, air, water
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 66
eISSN - 1863-0669
pISSN - 1863-0650
DOI - 10.1002/clen.201800416
Subject(s) - chemistry , soil ph , soil water , cadmium , soil acidification , lime , environmental chemistry , agronomy , soil science , environmental science , biology , paleontology , organic chemistry
The effect of pH increases following lime (Ca(OH) 2 ) addition on soil cadmium (Cd) availability is examined in three soils. The effect of Ca(OH) 2 addition (0–7.5 t ha −1 ) on crop Cd uptake and microbial community composition is evaluated in pot experiments with Chinese cabbage ( Brassica chinensis L.) and rice ( Oryza sativa L.). The soil pH increases significantly (by 1.21–2.57) after Ca(OH) 2 addition, which may be caused by both biological and chemical factors. The soil water‐exchangeable Cd content decreases substantially from 11.7 to 1.4% with Ca(OH) 2 application, and the iron and manganese oxide Cd fractions increase from 24.7 to 37.5%. Ca(OH) 2 significantly reduces the exchangeable Cd in acidic soil but has limited effects in neutral soil. Ca(OH) 2 can inhibit soil Cd activity and plant Cd absorption in acid soil. With increasing Ca(OH) 2 addition, the abundance of microorganisms tends to decrease, especially in the acidic soil, whereas it tends to increase in neutral soil. Principal components analysis and redundancy analysis among the soil environmental factors and the soil microbial phospholipid fatty acids show highly variable microbial community composition among soils and treatments. Soil pH has substantial effects on soil fungi, actinomycetes, and other microorganisms, the abundance of which decreases with increasing soil pH. The continuous use of Ca(OH) 2 has no significant effects on the abundance and distribution of soil microorganisms.