利用高分子吸水材料改良沙化地效应研究
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摘要
土地沙化,是指因人类不合理活动所导致的天然沙漠扩张和沙质土壤上植被及覆盖物被破坏,形成流沙及沙土裸露的过程。土地沙化是全球性的生态问题,是当今世界上最严重的环境问题之一,是严重影响人们生产生活的重大自然灾害。荒漠化问题已影响到全球100余个国家的36亿hm~2的土地,全世界陆地面积约1/3是干旱、半干旱荒漠地,而且每年以6万hm~2的速度在扩大。
     甘肃省沙漠化土地主要分布在河西走廊的腾格里、巴丹吉林和库姆塔格三大沙漠的前沿及其与绿洲的交接地带,风沙线东西长1600km,约66.7万hm~2的流动沙丘直接威胁着全省重要产粮基地的安全,土地沙化面积已经达到1203.5万hm~2,占全省国土总面积的28.3%,范围涉及8个市、州的24个县市区,不仅面积较大、分布集中,而且危害严重、扩展很快,使河西地区变成了全国四大沙尘暴策源地之一,直接危及全省大部分地区的生态安全。曾有“绿洲”美誉的民勤县有94%土地已经沙化。沙化土地面积的扩大,加剧了全省生态环境的恶化程度,严重制约着我省经济的可持续发展。2001年以来,温家宝总理就民勤的生态建设多次做出重要批示,要求全力以赴加快石羊河流域重点治理,决不能让民勤成为第二个罗布泊。
     尽管如此,荒漠化和土地沙化的总体形势仍然很严峻,主要表现在:①我国荒漠化、沙化土地面积基数大,防治任务十分艰巨。②导致荒漠化形成的诱因还没有消除,荒漠化地区经济社会发展缓慢与该地区群众对经济利益和物质文化需求快速增长之间的矛盾依然尖锐。
     根据对沙化地的研究和实践现状的认识,作者认为高分子吸水材料的科学应用,是解决沙化地增产问题的一个发展方向。由此提出本文研究工作的思路——围绕高分子吸水材料的科学应用展开本项研究工作:首先在查阅资料和现场调查的基础上,详细研究了沙化地和高分子吸水材料的特殊性;并在使用高分子吸水材料的条件下,研究水分和养分在沙化地土壤中传输的科学规律;以西北沙化区具有典型代表意义的农作物——马铃薯作为主要对象,检验本项研究工作的思路和技术方案的正确性和有效性。在整个研究工作中,既充分关注科学性,又充分关注实用性和可操作性。
     本项研究采用现有资料的查阅与实际试验相结合、室内模拟实验与田间试验相结合的技术路线,进行了下述主要方面的研究:
     (1)通过沙层条件下线性高分子吸水材料不同处理的试验,研究提高沙层的含水量、速效氮含量与马铃薯根系在沙层中的真实分布情况。
     (2)根据沙化地的特殊性,对试验地的基础养分状况和不同种植年限的沙地条件进行测定,对马铃薯播种后的生长过程进行分析,并对马铃薯的产量进行测定与分析,得出马铃薯在沙化地的较好种植模式,以指导农民进行农业生产。
     (3)通过以上试验,在受到约束的条件下,使水分和速效氮的下渗量明显减小,较大幅度地提高沙层的含水量和速效氮含量,为降低化肥使用量,提供可参考性的依据,并找到一条用高分子吸水材料改造、治理沙化地的途径。
     根据文献资料和现有的实际应用情况,试验选用由西北工业大学研制的线性分子结构的丙烯酸钾-丙烯酰胺聚合物,作为目前高分子吸水材料的代表样品来进行研究。
     本研究取得的主要成果:
     1.经过模拟试验,发现高分子吸水材料的吸水特性和对吸附、保持土壤水分的特性是有区别的,以前仅以吸附去离子水量,作为衡量吸水材料应用效果的方法,不能反映吸水材料在土壤溶液环境下的实际作用规律。
     2.提出的定位定量施用高分子吸水材料的方法,改变了水分和养分在沙层中的扩散分布,在作物主要根系分布的沙层中,实现了水分和主要养分的同步富集,实验地沙层速效氮的含量比对照增加了87.3%,水分含量也比对照明显增加。结果表明,用高分子水溶胶定位定量施用来改良沙化地,是一种具有研发潜力和推广价值的方法。
     3.经过测定发现,马铃薯的根系发育深度在0~20cm之间,此深度范围的鲜根重量占到鲜根总量的86.4%。其中以5~15cm深度范围的根系密度最大,占到鲜根总量的56.9%。
     4.高分子吸水材料的应用,使作物根系周围富集了较多的水分和养分,促进了作物根系的发育,使马铃薯的根鲜重和根干重分别多出了74.87%和69.35%。
     5.发现影响高分子吸水材料提高沙层含水量的主要因素有,高分子聚合物的分子结构、沙层中的含泥量、施用方法、施用位置及用量。
     6.常规条件下的沙化地,影响作物产量的因素主要是种植年限,即因灌溉黄河水所增加的沙层中的含泥量。在沙层含泥量低、水分和速效氮吸附能力差的沙化地中,经过聚合物的处理,改善了沙化地所种植作物的养分供给,马铃薯总产量超过了种植条件相对较好的沙壤土质地块。
Desertification is defined as a result that natural desert expansion and vegetation cover is destroyed in sandy soil and the exposed sand and quicksand are formated by unreasonable human activities.Desertification is a global ecological problems,the one of the world's most serious environmental problem and natural disasters which people's production and livelihood of major are affected seriously. The problem of desertification has affected 3.6 billion hm~2 of land in more than 100 countries., the world land area of about 1/3 is arid, semi-arid desert, but Desertification is enlarging at the rate of expansion every year 60,000 hm~2.
     Gansu Province desertified land are distributed mainly in the forefront and the transition zone of oasis which located in Tengger, Badain Jaran and Kumutage desert,landline is 1,600 km from east to west at length and about 667,000 ha of mobile dunes are directly threatened the province's major grain-producing base security. Desertified land area has reached 12.035 million ha,which accounting for the province's total land area of 28.3% and covering the 24 counties in eight cities,it is not only larger and centralized in distribution, but also a serious threat and expand quickly,which it result in Hexi area where became one of the four major source of dust storms, the province most directly threaten the ecological safety. There has been the "Oasis" Minqin County's reputation as a 94 percent land has been desertified. The expansion of desertified land area, the province's ecological environment exacerbated the extent of the deterioration, seriously restricting the sustainable economic development of our province. Since 2001, Premier Wen Jiabao on the ecological construction Minqin made important instructions on many occasions, go all out to speed up the Shiyang River Basin requirements focus governance, must not be allowed to become the second Minqin Lop Nor.
     Nevertheless, desertification and sandyland of the overall situation remains grim.It shows mainly as follows: First, the area of China desertification and sandy land base is large and the task is very arduous.Second, incentives lead to the formation of desertification has not been eliminated,the contradiction between slow economic and social development in the region and rapid growth of the masses of material and cultural demand for the people dewlling the region is still sharp.
     According to research of the deserts and understanding of the practice status, the authors believe that superabsorbent polymer materials science applications is a development direction to solve increasing production of desertification. This raised the idea of this research - it start the research around polymeric absorbent material on the scientific application: First, the special nature of polymeric and absorbent materials have been studied in detail by data access and on-site investigation; scientific laws of transmission of moisture and nutrients have been studied under the conditions of the use of absorbent material in the polymer; with a typical representative of potato crops as a main target in Northwest sandy areas, legitimacy and effectivity of the ideas and the technical program have been tested. Throughout the study, both full attention scientific, and full attention practical, and serviceable have been considered.
     The study used routes of technology which combined the existing data access with the actual test, which combined indoor simulated experiments with field test, the following main areas of research were carried out:
     First,it may raise sand layer on the water content, available nitrogen content and the real distribution of potato root in the sand layer under the conditions of the use of polymeric absorbent material with different tests.
     Second,we would test nutrient status and conditions of sand different planting years in the field,analyze the growth process of potatoes after sowing and the production of potatoes,and the conclusion that the better cropping patterns can adjust to potatoes can be arrived at ,which guide farmers to undertake agricultural production.
     The last, Through these experiments, in the constrained conditions, the water and the infiltration of available N significantly were reduced, sand layers and the available nitrogen content of moisture were enhanced greatly,it provide referenc to reduce the use of chemical fertilizers, and find a way to control desertification to use polymeric absorbent material transformation.
     According to written information and the practical application, as the current high representatives of superabsorbent material samples-- the potassium acrylate -acrylamide polymer were chose ,which were made by the Northwestern Industry University.
     The major achievements of this study has made:
     1. After simulation test and found that the absorbent polymer absorbent material properties and adsorption, and maintain the characteristics of soil moisture is differentiated,Previously only adsorption deionized water absorbent materials as a measure of effectiveness of the method, does not reflect the absorbent material in the soil solution in the actual effects of environment laws.
     2. The application of quantitative positioning superabsorbent polymer materials, changes the moisture and nutrients in the sediment layer diffusion distribution, mainly root crops in the distribution of sand layers, and achieving the water and the main nutrient enrichment synchronization, experimental and sand layers available N content than the control increased by 87.3 %. Results showed that using polymer hydrosol positioning quantitative application to upgrade deserts, is a kind of research and development potential and to promote value method.
     3. The result indrcated that the depth of Potato root development is 0 to 20 cm .between the depth that the fresh root weight account for the total 86.4%. thereinto 5~15 cm depth ,the root system is the greatest density, account for the total of fresh root 56.9%.
     4. Polymeric absorbent material around the root crops enriched with more moisture and nutrients, and promote the development of root crops, potatoes fresh weight of the root and root dry weight were more of 74.87% and 69.35%.
     5. Found that the impact of superabsorbent polymer materials raising sand layer moisture has a major factor, the molecular structure of polymers, mud contend in sand layer, application method, location and amount of application.
     6. Desertification under conventional conditions, factors affecting crop yield is the main planting period, that is due to the increase in irrigation water of the Yellow River mud containing in sediment layer . In the sand layer with a low volume of mud, water and available nitrogen adsorption capacity is poor in this desertification, by the polymer processing, improved crops plants the nutrient supply in the desertification .the total output of potato more than cultivation conditions relatively good sandy loam texture block.
引文
[1] 李星,世界荒漠化现状与防治对策[J],世界林业研究,2000,13(5):1-6.
    [2] 邹志荣等,西北荒漠化地带发展设施园艺的意义与作用[J],华中农业大学学报,2004(12)(增刊):26—28.
    [3] 郑良永,保水剂在我国的研究应用现状与展望[J],广西热带农业,2005(6):26-27.
    [4] 《2005年中国环境状况公报》.
    [5] 楚可要,生态脆弱带沙化地流失规律研究[J],草地生态,2006(11):41-43.
    [6] 徐守盛在甘肃省防沙治沙大会上的讲话,甘肃日报,2007-11-17,第一版.
    [7] 韩茂莉,论西北开发的可持续性进程[J],北京大学学报(哲学社会科学版),2003,40(3):109—116.
    [8] 王晓娟,粏淮海等,平原沙地不同治理利用措施下土壤性质的差异[J],中国沙漠,1999,19(3):289-292.
    [9] 段争虎,肖洪浪等,流沙和改良后土壤无机磷形天分级及其有戌性研究[J],中国沙漠,2001,21(2):195-199.
    [10] 陈建斌等,有机物料对土壤中外援铜形态及土壤伙学性质的影响[J],农业环境保护,2000,19(1):38-40.
    [11] 傅汝文等,糖蜜酒精废液制半有机肥料的生产实践[J],广西轻工业,2000(2):33-34.
    [12] 张亚丽等,有机肥料对土壤有机磷组分及生物有效性的影响[J],南鹃农业大学学报,1998,21(3):59-63.
    [13] 周艺敏等,有机肥料在半干旱条件下的残留特点[J],天津农业科学,1997,3(2):5-8.
    [14] Roldan A lAlbanladejo J, Aggregate stability changes in semiarid soilafter treatment with different organic amendments [J]. Arid SoilResearch and Rehabilitation, 1996,10:139-148.
    [15] Chandrasekaran S, Yoshida TnEffect of organic acid transforma tion in submerged soils on rice plants [J]. Soil Science and PlantNutrition, 1973 (19): 39-45.
    [16] 彭继平,论制约我国荒漠化防治的若干问题[J],中国水土保持,2006(4):1.
    [17] 范永军,阿拉善地区沙地治理开发环境影响因素分析及对策探讨[J],内蒙古水利,2006(3):52-59.
    [18] 陈洪山,东平湖库区“翻壤压沙”改土技术研究与分析[J],水利经济,2004(3).
    [19] 对在沙漠地区应用化学固沙剂固沙的探讨[J],灾害学,第18卷第1期,2003年12月:1-2
    [20] 江帆,防治沙漠化需要新思维[J],环境经济杂志,2004(10).
    [21] 蒋亚娟,沙化地区生态保护与扶贫的冲突及整合初探,第17卷第4期,2002年12月:57-59
    [22] 苏文强,高吸水树脂在土壤改良中的效应[J],东北林业大学学报,2004,32(5):35-36
    [23] 孟志伟,施用缓释型保水剂条件下土壤水分状况及氮素运移特征的研究,安徽农学通报,2006,12(5):52—54
    [24] 西南农业大学主编,土壤学第二版[M],农业出版社,1986:104—108.
    [25] 王晗生等,保水剂农用抗旱增效研究现状[J].干旱地区农业研究,2001,19(4):38—44.
    [26] 吴德瑜,保水剂与农业[M].北京:中国农业科技出版社,1991.
    [27] 陈宝玉等,保水剂的研究开发现状及应用展望[J].河北农业大学学报,2003(26):242-245.
    [28] 陈茂铨等,保水剂及其在水土保持和造林绿化中的应用[J].林业科技开发,2002,16(4):12—14.
    [29] 朱云峰,保水剂对松苗抗旱及与抗松树枯梢病关系的研究[D],南京林业大学,2004.
    [30] 王九龄,林业科技论文集[G],中国林业出版社,2002.
    [31] Reda A I, Polymers conditioner gels for desert soils[J], Communication in Science and Plant annuals, 1983(8): 38—40.
    [32] 韩茂莉,论西北开发的可持续性进程[J].北京大学学报(哲学社会科学版),2003,40(3):109-116.
    [33] 王浩,西部大开发战略下的西北水资源开发、利用与保护[R].中国水利学会2003学术年会特邀报告
    [34] 李雅丽,耐电解质高吸水性树脂的合成及其吸液性研究[J].应用化工,2003,32(4):27-29.
    [35] 李云开等,保水剂农业应用及其效应研究进展[J],农业工程学报,2002,(2):182—186.
    [36] 何腾兵等,VAMA对土壤保肥供肥性能影响的研究[J],土壤通报,1997,28(6):257—260.
    [37] 李云开等,保水剂农业应用及其效应研究进展[J],农业工程学报,2002(2):182-186.
    [38] 介晓磊等,保水剂对土壤持水特性的影响[J],河南农业大学学报,2000,34(1):22-24.
    [39] 邹新禧,超强吸水剂[M],化学工业出版社,2002(1),473-35.
    [40] 李建法等,纤维素制备高吸水材料研究进展[J],林产化学与工业,2002,22(2):81-85.
    [41] Wellace A, Effects of energy level of a polymer as a soil conditioner on yield and mineral nutrition of plants[J], Soil Sci, 1986, 141(5): 89-92.
    [42] Wellace A, Amelioration of soils with polymers[J], Soil Sci, 1986, 141(5):121-129.
    [43] Mithell A R, Polyacrylamide application in irrigation water to increase in filtration[J], Soil Sci, 1986, 141(5): 51-57.
    [44] 杨本宏,强高分子吸水材料的研究进展与应用[J],合肥联合大学学报,2002,12(3):97-102.
    [45] 蔡典雄等,保水剂及其应用技术[J],农业科技通讯,2000(8):22.
    [46] 王斌瑞等,保水剂在造林绿化中的应用[J],中国水土保持,2000(4):22-24.
    [47] 杨本宏,超强高分子吸水材料的研究进展与应用[J],合肥联合大学学报,第12卷第3期,2002年9月:98
    [48] 李云开等,保水剂农业应用及其效应研究进展[J],农业工程学报,2002(2):182-186.
    [49] 何天白等,功能高分子与新技术[M],化学工业出版社,2001(1):523-555
    [50] 赵永贵,保水剂的开发及应用进展[J],中国水土保持,1995(5):52-54.
    [51] 何天白等,功能高分子与新技术[M],化学工业出版社,2001(1):523-555.
    [52] 赵永贵,保水剂的开发及应用进展[J],中国水土保持,1995(5):52-54.
    [53] 张保军,保水剂在农业上的应用现状及前景分析[J],水土保持研究,2002(6):51-54
    [54] Woodbouse J, Johnson MS, Efect Of upper Absorbent olymers n urvival and rowth frop eedling[J] Agricultural ater Management1991 (20): 63-70.
    [55] 李青峰,高分子吸水材料的农业应用研究进展[J],湖南农业科学,2001(3):45-46.
    [56] Lee W Y, Wu R J. Studies on the synthesis of water-absorbing polymers[J]. Appl PolymSci, 1996(62): 1009-1017.
    [57] 马凤国等,超强吸水树脂的吸水性能研究[J],高分子材料科学与工程,2002,18(5):199-201.
    [58] Flory P J. Principles of polymer chemistry[M]. New York: Comell Univ. Press,1953.
    [59] 中国科学院南京土壤研究所[M],土壤理化分析,上海科学技术出版社,1978.502-532.
    [60] 李云开等,保水剂农业应用及其效应研究进展[J],农业工程学报,2002,(2):182—186.
    [61] 李雅丽,耐电解,质高吸水性树脂的合成及其吸液性研究[J].应用化工,2003,32(4):27-29.
    [62] 刘瑞凤,PAA—atta复合保水剂对土壤物理性质的影响[J],土壤通报, 第37卷第2期,2006年4月,231-235.
    [63] 苟春林,氮肥对保水剂吸水保肥性能的影响[J],干旱地区农业研究,2006年11月,第24卷第6期,78-84.
    [64] 王东晖,化肥与微肥对保水剂吸水性的影响试验初报[J],甘肃农业科技,2002(5):22-23
    [65] Flory P J. principles of Polymer Chemistry[M]. New York: Comell University Press,1953
    [66] 黄麟等,6种保水剂吸水保水性能的比较[J],南京林业大学学报(自然科学版),第31卷第2期,2007年3月:01-104.
    [67] 马凤国等,超强吸水树脂的吸水性能研究[J].高分子材料科学与工程,2002,18(5):199-201.
    [68] 谢伯承,保水剂对土壤持水性状的影响[J],水土保持通报,第23卷第6期,2003年12月:44-46.
    [69] 王振宇,生物活性保水剂对模拟沙化土地治理效果的分析[J],东北林业大学学报,第31卷第3期,2003年5月:27-28.
    [70] 康玲玲等,PAMN保水剂施用量与施用方法对作物出苗率的影响[J].河南农业科学,1998(7):16-18.
    [71] 徐卯林等,高吸水种衣剂及其在水稻旱育秧上的应用技术[J],种子,1998(2):61-63.
    [72] 肖冰雪等,高分子吸水剂在沙地植被重建中的盆栽效果试验[J],四川草原,2003(1):30-34.
    [73] 何景峰等,SA型高效保水剂对造林成活率及苗木生长的影响[J],陕西林业科技,1994(3):76-78.
    [74] Ben Hur M, Fails J, Malik M, et al. Polymers as soil conditioners ander consecutive irrigation and rainfall[J]. Soil Sci Soc Am J, 1989(53): 1173-1177.
    [75] Ben Hur M, Keren R. Polymer effects on water in filtration and soil ggregation[J]. Soil Sci Soc Am J, 1997(61): 565-570.
    [76] Levin J, Ben Hur M, Gal M, et al. Rain energy and soil amendment effects on infiltration and erosion ofthree different soil types [J]. Aust J Soil Res. 1991, 29: 455-465.
    [77] Lentz R D, Shainberg R E, Sojka, et al. Preventing irrigation rille rosion with small application of polymers[J]. Soil Sci Soc Am J, 1992(56): 1926-1932.
    [78] SojkaR E, LentzR D, Westerman DT. Waterand erosionmanagemen twith multiple application of polyacrylamide in furrow irrigation[J]. Soil Sci Soc Am J, 1998(62): 1672-1680.
    [79] 黄麟等,6种保水剂吸水保水性能的比较[J],南京林业大学学报(自然科学版),第31卷第2期,2007年3月:101-104.
    [80] 赫延龄等,保水剂结合矿质元素对水稻幼苗生长发育的影响[J],西北植物学报,1997,17(1):124-127.
    [81] 马天新等,土壤保水剂在我省旱作农业上的应用展望[J],甘肃农业科技,1997,(12):31-32.
    [82] 盛志政,化学抗旱剂保水剂在农业上的应用[J],中国农学通报,1990,6(4):41.
    [83] 杜尧东等,保水剂及其在节水农业上的应用[J],河南农业大学学报,2000,34(3):255-259
    [84] 史兰波,李云荫_保水剂在节水农业中的应用[J].生态农业研究,1993,1(2):89-94.
    [85] 李云开等,保水剂在农业上的应用技术与效应[J],节水灌溉,2002,(2):12-17.
    [86] 汪亚峰,20种保水剂吸水特性研究[J],中国农学通报,第21卷第1期,2005年1月,167-170.
    [87] 李云开等,保水剂农业应用及其效应研究进展[J],农业工程学报,2002(2):182—186.
    [88] 李雅丽,耐电解质高吸水性树脂的合成及其吸液性研究[J],应用化工,2003,32(4):27-29.

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