硬壳覆盖条件下土壤冻融期水盐运动规律研究

摘要/Abstract

摘要： 采用大田试验,研究了水泥硬壳覆盖后冻融期土壤温度、水分、盐分的变化规律;采用室内土柱试验,研究了冻融交替时期土壤中的水盐运动规律.试验表明,土壤水泥硬壳覆盖后土壤的冻结时间减少,冻结深度变浅;明显抑制土壤水分的无效蒸发;明显抑制土壤在融冻时期的土壤返盐.同时由于"冻层滞水"在春季的融化,有淋洗表层土壤盐分的作用,使土壤表层脱盐.土柱冻融试验进一步说明,土壤经冻融过程后,土壤中的水盐发生了重新分布.

关键词: 硬壳覆盖, 冻融期, 水盐运动

Abstract: Temperature and migration of water and salt in soil were studied in detail under concrete mulch through two in situ experiments and one big soil column experiment. The migration of water and salt was studied during the freezing/thawing period by way of indoor experiment. Soil temperature was studied at the same time. The results show that soil temperature under concrete mulch was 1～1.5℃ higher than that in the control plot, the freezing period was shortened, and the average freezing depth decreased 15 cm under concrete mulch as compared with than that on the control plot. Therefore, if soil was mulched by concrete, freezing area in 20 cm soil profile is less than that in the bare plot. At the same time, soil evaporation and salt accumulation in the surface were reduced during the freezing/thawing period. The results show that soil water rapidly moved upwards to the freezing layer, then frozen stagnant water formed. The amount of frozen stagnant water in the mulching plot is more than that in the control plot. The experiments show that 80 mm frozen stagnant water may form in one winter. The frozen stagnant water may seep with surface salt downwards after thawing in spring. The in situ experiments show that soil salt content under concrete mulch may decrease 20%～30%. Soil column experiment shows that water and salt in soil may migrate during freezing/thawing period. Soil temperature, soil profile structure, original soil moisture and depth of groundwater are the factors that affect water and salt migration in soil profile during the freezing/thawing period. Therefore, the migration of water and salt in soil during the freezing/thawing period is very complicated. Concrete mulching is similar to plastic mulching in decreasing water evaporation and salt accumulation in the surface, but concrete mulching is better than felt or straw mulching against water and salt accumulation in the surface. All experiments show that concrete mulching is a good method for improving saline soil.

Key words: concrete mulch, freezing/thawing period, water and salt migration

中图分类号:

S156.4

李伟强, 雷玉平, 张秀梅, 田魁祥. 硬壳覆盖条件下土壤冻融期水盐运动规律研究[J]. 冰川冻土, 2001, 23(3): 258-257.

LI Wei-qiang, LEI Yu-ping, ZHANG Xiu-mei, TIAN Kui-xiang. Study of Water and Salt Migration in Soil under Concrete Mulch during Freezing/Thawing Period[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2001, 23(3): 258-257.

参考文献

[1] Xu Xiaozu. Research of moisture transfer in frozen soil in foreign countries[J]. Journal of Glaciology and Geocryology,1982,4(3):97-103.[徐敩祖.国外对冻土中水分迁移课题的研究[J].冰川冻土,1982,4(3):97-103.]
[2] Cheng Guodong. Glaciology and Geocryology of China in thepast 40 years: Progress and prospect[J]. Journal of Glaciology and Geocryology, 1998, 20(3):213-223.[程国栋.中国冰川学和冻土学研究40年进展和展望[J].冰川冻土,1998,20(3):213-223.]
[3] Ma Wei, Zhu Yuanlin, Xu Xiaozu. The State Key Laboratoryof Frozen Soil Engineering: Review and Prospect[J]. Journalof Glaciology and Geocryology, 1998, 20(3): 264-268. [马巍,朱元林,徐敩祖.冻土工程国家重点实验室的回顾与展望[J].冰川冻土,1998,20(3):264-268.]
[4] Cheng guodong. Glaciology and geocryology of China duringthe past 40 years: Progress and Prospects [J]. Journal ofGlaciology and Geocryology, 1999, 21(4):289-309.
[5] Ma Wei, Cheng guodong, Zhu yuanlin, et al. The State KeyLaboratory of Frozen Soil Engineering Review and Prospect[J]. Journal of Glaciology and Geocryology, 1999, 21 (4):317-325.
[6] Harlan R L. An analysis of coupled heat-fluid transport inpartially frozen soil [J]. Water Research, 1973, 9: 1314-1323.
[7] Yue Hansen. Primary study on model for coupled heatmoisture- salt process [J]. Journal of Glaciology and Geocryology,1994,16(4): 308-312.[岳汉森.土壤在冻融过程中水-热-盐耦合运移数学模型之初探[J].冰川冻土,1994,16(4):308-312.]
[8] Xu Xiaozu. Experiment Research of Moisture Transfer in Frozen Soil [M]. Beijing: Science Press, 1991. 38-43,141-143.[徐敩祖.冻土中水分迁移的实验研究[M].北京:科学出版社,1991.38-43,141-143.]
[9] Na Pingshan, Xu Shulin. An approach to the formation mechanism of frozen perched ground water [J]. Journal of Glaciology and Geocryology, 1996,18(3):273-277.[那平山,徐树林.冻结滞水形成机制的探讨[J].冰川冻土,1996,18(3):273-277.]
[10] Hu Heping, Yang Shixiu, Lei Zhidong. A numerical simulation for heat and moisture transfer during soil freezing [J].Journal of Hydraulic Engineering, 1992, (7): 1 - 8.[胡和平,杨诗秀,雷志栋.土壤冻结时水热迁移规律的数值模拟[J].水利学报,1992,(7):1-8.]
[11] Zhao Donghui. Groundwater consuming in original soil duringfreezing period [J]. Journal of Glaciology and Geocryology,1997,19(1):73-78.[赵东辉.原状土冻结期间潜水消耗初步研究[J].冰川冻土,1997,19(1):73-78.]
[12] Lei Zhidong, Shang Songhao, Yang Shixiu,et al. Numericalsimulation on simultanous soil moisture and heat transfer under shallow ground water table in winter [J]. Journal of Glaciology and Geocryology, 1998, 20(1):51-54.[雷志栋,尚松浩,杨诗秀,等.地下水浅埋条件下越冬期土壤水热迁移的数值模拟[J].冰川冻土,1998,20(1):51-54.]
[13] Lei Zhidong, Shang Songhao, Yang Shixiu, etal. Simulationon phreatic evaporation during soil freezing [J]. Journal ofHydraulic Engineering, 1999,(6):6-9.[雷志栋,尚松浩,杨诗秀,等.土壤冻结过程中潜水蒸发规律的模拟研究[J].水利学报,1999,(6):6-9.]
[14] Zhou Deyuan. Regularity of frost heave of the seasonally frozen soil in Hero Irrigation Area, Inner Mongolia [J]. Journalof Glaciology and Geocryology,1993, 15(2):266-261.[周德源.内蒙古河套灌区季节冻土冻胀规律[J].冻川冻土,1993,15(2):266-261.]
[15] Wang Shaoling, Yang Meixue, Toshio Koike, et al. Application of Time - Domain - Reflectometer to researching moisturevariation in active layer on the Tibetan Plateau [J]. Journal ofGlaciology and Geocryology, 2000, 22 (1): 78 - 84.[王绍令,杨梅学,小池俊雄,等.时域反射仪在检测青藏高原活动层水分变化过程中的应用[J].冰川冻土,2000,22(1):78-84].
[16] Chen Xiaobai, Qiu Guoqing, Wang Yaqing, et al. Salt redistribution and heave of saline soil during cooling [J]. Journalof Glaciology and Geocryology,1989,11(3): 231-238.[陈肖柏,邱国庆,王雅卿,等.温降时之盐分分布及盐胀试验研究[J].冰川冻土,1989,11(3):231-238.]
[17] Qiu Guoqing. Improvement of saline in the seasonally frozenground regions [J]. Journal of Glaciology and Geocryology,1991,13(1):9-16.[邱国庆.论季节性冻结区直渍土改良问题[J].冰川冻土,1991,13(1):9-16.]
[18] Gao Weiyue, Xu Xiaozu. Field observations of water intakeflow in unsaturated freezing soil with different groundwatertables [J]. Journal of Glaciology and Geocryology, 1989, 11(2):137-147.[高维跃,徐敩祖.土层冻结期间地下水人流量的现场观测[J].冰川冻土,1989,11(2):137-147.]
[19] Gong Jiadong, Qi Xusheng, Xie Zhongkui, et al. Effect ofseasonal freezing on soil moisture and its significance for agriculture [J]. Journal of Glaciology and Geocryology, 1997, 19(4): 328-333.[龚家栋,祁旭升,谢忠奎,等.季节冻融对土壤水分的作用及其在农业生产中的意义[J].冰川冻土,1997,19(4):328-333.]
[20] Li Shuxun, Cheng Guodong. The Problems of Heat andMoisture Transfer in Frozen Soil [M]. Lanzhou: Lanzhou University Press,1995.106-113[李述训,程国栋.冻土中水热输送问题[M].兰州:兰州大学出版社,1995.106-113]
[21] Zhang Zhenhua,Yan Shaohua, Pan Hong. Quantify researchon the effect of mulching in coastal saline soil [J]. ChineseJournal of Soil Science, 1999,29(2): 52-53.[张振华,严少华,潘宏.滨海盐土覆盖栽培节水抑盐效果定量研究[J].土壤通报,1999,29(2):52-53.]
[22] Li Xinju, Zhang Zhiguo. Effect of straw mulching on soil evaporation and salt [J]. Chinese Journal of Soil Science, 1999,30(6),257-258.[李新举,张志国.秸秆覆盖对土壤水分蒸发及土壤盐分的影响[J].土壤通报,1999,30(6):257-258.]
[23] Qi Xusheng, Lan Nianjun, Xie Zhongkui. Research on maizeyield-increasing cultivation technology with water-saving bywhole ground plastic sheet mulching [J]. Agricultural Research in the Arid Areas, 1996,14(2):26-30.[祁旭升,兰念军,谢忠奎.全地面地膜覆盖玉米节水增产栽培技术研究[J].干旱地区农业研究,1996,14(2):26-30.]
[24] Mao Xuesen, Tian Kuixiang. Effects of concrete mulch onfarmland eco-system [J]. Research of Agricultural Modernization.1997,18(5): 298-301.[毛学森,田魁祥.硬壳覆盖对农田生态系统的影响[J].农业现代化研究,1997,18(5):298-301.]
[25] Zhang Lixin, Xu Xiaozu, Deng Yousheng. Unfrozen watercontent of soil containing NaCl relating to freezing-thawingprocesses [J]. Journal of Glaciology and Geocryology, 1995,17(3):258-262.[张立新,徐敩祖,邓友生.含氯化钠土未冻水含量与冻融过程关系的特征[J].冰川冻土,1995,17(3):258-262.]
[26] Fang Rulin. Preliminary study on the dynamical regime of water and salt during the freezing and thawing period of soil [J].Acta Pedologica Sinica, 1982, 19(2): 100.[方汝林.土壤冻结、消融期水盐动态初步研究[J].土壤学报,1982,19(2):100.]
[27] Wang Jiacheng,Cheng Guodong, Zhang Hongding, etal.Experimental study on conditions for ice formation of saturated sand in freezing and thawing cycles [J]. Journal of Glaciology and Geocryology,1992,14(2):101-104.[王家澄,程国栋,张宏鼎,等.饱水砂土反复冻融时成冰条件的试验研究[J].冰川冻土,1992,14(2):101-104.]
[28] Gao Yong, Na Pingshan, Xu shulin, et al. Formation of frozen stagnant water and its application to afforestation in thearid areas [J]. Journal of Glaciology and Geocryology, 1999,21(3):269-272.[高永,那平山,徐树林,等.干旱地区冻结滞水的形成及其在造林中的应用[J].冰川冻土,1999,21(3):269-272.]