| This article has been：Browse 2111Times Download 3305Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.20180101 |
|
| Salt Leaching from Salt-affected Soils under Different Leaching Methods in the Yellow River Delta |
|
YIN Chunyan, CHEN Xiaobing, LIU Hu, QIN Song, SUN Haishuan, ZHANG Libin
|
|
1.Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Chinese Academy of Sciences, Yantai 264003, China; 2. Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot 010010, China; 3. Institute of Water Resources for Pastoral Area Ministry of Water Resources， Hohhot 010010, China; 4. Shandong Huibang Bohai Agricultural Development Co., Ltd, Dongying 257091, China; 5. Dongying Institute of Science and Technology Information, Dongying 257091, China
|
| Abstract: |
| 【Objective】 The objective of this paper is to experimentally study the efficacy of different leaching methods in reclaiming the salt-affected soil in the Yellow River Delta.【Method】The experiments were conducted in columns packed with saline soil, and we compared two leaching methods: continuous leaching and intermittent leaching. In each treatment, we measured the water consumption of the leaching, the changes in salt content in the leachate, the accumulative leachate, as well as salt leaching rate. In the meantime, we also measured the electrical conductivity in soil at 0~20 cm, 20~40 cm, 40~60 cm, 60~80 cm and 80~100 cm depth.【Result】 ①There were three distinctive processes during the leaching process, including salt-peak formation process, downward movement of the dissolved salt and attenuation of the salt peak. Continuous leaching and intermittent leaching required 472.70 mm and 411.60 mm of water respectively to make the 0~60 cm soil able for crops to grow. ②The change in salt concentration in the leachate under continuous and intermittent leaching with time followed a power-law during the experimental period, and the desalination efficiency of the continuous and intermittent leaching was 18.45 g/L2 and 28.49 g/L2, respectively. ③ Taking 40~60 cm soil as an example, the leaching rate in it after continuous and intermittent leaching was 88.11% and 91.61% respectively. The increase in pH along the soil profile under intermittent leaching was less than that under continuous leaching. Although the soil pH in each soil layer increased slightly after intermittent leaching, it was within the tolerant range of plant growth. The decrease in SAR under intermittent leaching was less than that under continuous leaching, as supposed to RSC. However, both SAR and RSC were within the tolerant range for plant to grow.【Conclusion】Both continuous and intermittent leaching can desalinate the top soil to make it able for crops to grow, but the intermittent leaching was more water-efficient. |
| Key words: saline soil； soil column simulation； intermittent leaching and desalination； mineralization degree；desalination efficiency |
|
|
