Evaluation of the effects of seven herbaceous plants on the improvement of saline soil in the tidal flat reclamation area of Taizhou

doi:10.14088/j.cnki.issn0439-8114.2021.16.010

Abstract

Abstract: To evaluate the improvement effects of common salt-tolerant plants on coastal saline soils, seven artificial populations including Medicago sativa, Suaeda salsa, Melilotus officinalis, Sorghum dochna, Sorghum bicolor×Sorghum sudanense, Lolium perenne and Sesbania cannabina were constructed in the Taizhou tidal flat reclamation area, and the physical and chemical properties, the number of microorganisms and soil enzyme activities of 0~10 cm soil were measured after planting in 30 d interval. The results showed that compared with the control （bare land）, the salt content, pH and soil bulk density of the planting soil gradually decreased with increasing the experiment time, which decreased by 6.9%~12.2%, 7.5%~10.5%, and 28.5%~42.5% at 90 d, respectively; Organic matter, total nitrogen, total phosphorus content and nitrate reductase activity of planting soil gradually increased with time （with some exceptions）, compared with the control, they decreased by 24.5%~72.3%, 10.2%~90.8%, 78.9%~181.1% and 428.6~533.0% at 90 d, respectively; Compared with the control, the number of soil bacteria and catalase activity increased had no significant differences at 90 d, but the number of actinomycetes in soil planted with Sorghum dochna, Sorghum Bicolor×Sorghum Sudanense grass and Sesbania cannabina were significantly higher than that of the control on the 90 d; Principal component analysis indicated, the 10 individual indexes related to the effect of plants on soil improvement were converted into 5 comprehensive indexes, representing 97.32% of the total information. In order to calculate the membership function value of the planting soil of each plant, and the contribution rate of the principal component after weighting, the comprehensive evaluation value （D） of soil properties was finally obtained, the improvement effects of 7 herbaceous plants on the local saline soil in Taizhou were Medicago sativa>Melilotus officinalis> Sorghum bicolor×Sorghum sudanense grass>Lolium perenne>Sorghum dochna>Sesbania cannabina>Suaeda salsa.

Key words: saline soil, microorganisms, soil enzyme activity, principal component analysis, comprehensive evaluation

CLC Number:

S156.4

RUAN Jia-ping, DU Zhao-kui, WU Xia-shan, DAI Ze-miao, YU Lan, YUAN Yi-qi, LI Jun-min. Evaluation of the effects of seven herbaceous plants on the improvement of saline soil in the tidal flat reclamation area of Taizhou[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(16): 50-56.

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