【作者】 吴落霞；

【导师】 杨吉华；

【作者基本信息】 山东农业大学 ， 水土保持与荒漠化防治， 2011， 硕士

【摘要】 本文对I-107杨树人工林不同保水措施的保水效应及对林木生长量影响进行研究。分析了不同保水措施下I-107杨树人工林的土壤含水量、土壤蓄水性能、土壤改良效应、林木生长量状况。并根据杨树的生理特性,用Logistic曲线方程来表达I-107杨树人工林树高、胸径、单株材积的生长规律,模拟其生长过程并进行检验。对不同保水措施下I-107杨树人工林的生长量进行静态和动态经济效益分析。研究结果表明:1、各处理0-20cm土层的土壤含水量在6月7日降到测定时段的最低值。各值相比较,单一处理的覆黑膜比对照多58%,黑+保比覆黑膜多20%,比对照多89%,多重处理的黑+草+保比黑+保多5%,比覆黑膜多25%,比对照多98%。各处理保持土壤水分效果大小依次为黑+草+保>白+草+保>黑+保>白+保>黑+草>白+草>草+保>覆黑膜>覆白膜>覆草>保水剂>对照。多重处理要大于双重处理大于单一处理大于对照。2、与实施保水措施的第1a相比,多重处理的黑+草+保、白+草+保分别增长35.97%、35.75%;草+保、黑+草、白+草、黑+保、白+保分别增加34.09%、34.17%、33.98%、30.64%、31.63%;覆黑膜、覆白膜、覆草、保水剂、对照分别增加28.24%、27.21%、27.13%、28.28%、23.83%。各保水措施下的土壤贮水量在实施保水措施的第2a至第4a土壤饱和贮水量增长最快,土壤饱和贮水量的增加值占实施保水措施7a的土壤饱和贮水量增加值的47%以上。分别对土壤毛管最大持水量和土壤饱和贮水量进行方差分析,均得Sig.=0.000<0.05,说明各保水措施的土壤毛管最大持水量和土壤饱和贮水量均存在显著差异。3、土壤容重前4a减小较快,约占60%-70.66%。实施保水措施第7a,各保水措施处理的土壤容重与对照相比,减小的程度更加明显,多重处理的黑+草+保、白+草+保分别减少12.50%、11.72%;双重处理的黑+草、白+草、黑+保、白+保、草+保分别减少10.16%、10.16%、9.37%、7.03%、7.81%;单一处理的覆黑膜、覆白膜、保水剂、覆草分别减少4.69%、3.91%、3.91%、4.69%。不同保水措施的土壤总孔隙度都有所增加,多重处理的黑+草+保、白+草+保增加最多,分别为5.40%、5.42 %;双重处理的草+保、黑+草、白+草、黑+保、白+保分别增加5.35%、5.36%、5.34%、5.33%、5.26%;单一处理的覆黑膜、覆白膜、覆草、保水剂、对照分别增加5.24%、5.24%、5.20%、5.19%、5.07%。对实施保水措施第7a的土壤容重、土壤孔隙度进行方差分析,土壤容重、土壤总孔隙度的P值都为0.000 <0.01。说明实施保水措施后的土壤容重、土壤总孔隙度均存在显著差异。4、树高在1-4a生长迅速,各保水措施下的树高1-4a生长量占总生长量的53%-56%。从第4a开始,各保水措施下的树高生长量开始出现差异。树高年平均生长量1a时较低,2-4a逐年增大,4a达到峰值,然后生长缓慢。胸径在2-5a生长迅速,各保水措施下的胸径2-5a生长量约占总生长量的72%。胸径年平均生长量在第5a达到最大值。各保水措施的单株材积在第3-6a生长迅速,约占总生长量的73%。各保水措施在促进树高、胸径、单株材积方面的作用大小依次为:多重处理>双重处理>单一处理>对照。12种处理按照保水措施的类型分成4类,分别是对照、单一处理、双重处理、多重处理,分别对树高、胸径、单株材积的四类之间进行方差分析得Sig.=0.001﹤0.05,说明各类之间均存在显著差异。5、不同保水措施处理条件下杨树人工林树高、胸径、单株材积动态模拟的相关系数R2都在0.96以上。树高速生点为第2a-3a,速生期的起始点均为第1a,终止点为第4a-5 a。胸径速生点为第3a -4a,胸径起始点均为第1a-2a,终止点为第5a-6a。单株材积速生点为第4a-5a,速生期的起始点均为第3a,终止点为第6a-7a。6、各处理的树高、胸径、单株材积的实测值和模型模拟值T值检验的双边显著性概率分别在0.362-0.980、0.168-0.837、0.120-0.634之间,均大于0.05,说明各保水措施之间的树高、胸径、单株材积实测值和模拟值均不存在显著性差异。7、各处理的投入产出比从大到小依次为白+保>黑+保>覆白膜>覆黑膜>黑+草+保>白+草+保>保水剂>白+草>黑+草>草+保>覆草>对照。年均利润均达到12645.56元/hm2·a以上。资金利润率每投入100元均能带来376.66元以上的利润。不同保水措施下杨树人工林净现值率在4.76-5.67之间,均大于对照的3.77。更多还原

【Abstract】 Different materials were carried out on the I-107 poplar plantation.Analyzed soil water content, soil maximum capillary cpacity and soil saturated water content, soil physical characteristic, growth quantity condition of I-107 poplar plantation. Used Logistic curve equation to express and inspect the height, dbh, and individual volume of I-107 poplar plantation. Measures on the I-107 poplar plantation static and dynamic economic analysis in different water retention covering.The research were as follows:1. The minimum soil water content was on June 7 of 0-20cm depth in different water retention covering. Black veil mulch was more than 58% compared with contrast. Soil with water absorbing resin and black veil dual mulch were more than 20% compared with black veil mulch ,more than 89% compared with contrast. Soil with water absorbing resin and wheatstraw and black veil multiple treatments were more than 5% compared with soil with water absorbing resin and black veil dual mulch, more than 25% compared with black veil dual mulch, more than 98% compared with contrast.The effective of different water retention covering were soil with water absorbing resin and wheatstraw and black veil multiple treatments > soil with water absorbing resin and wheatstraw and white veil multiple treatments > soil with water absorbing resin and black veil dual mulch > soil with water absorbing resin and white veil dual mulch > black veil and wheatstraw dual mulch > white veil and wheatstraw dual mulch > soil with water absorbing resin and wheatstraw dual mulch >black veil mulch>white veil mulch>wheatstraw mulch>soil with water absorbing resin >contrast. Multiple treatments were better than dual treatments, and more than single treatments.2. Compared with the first year,soil maximum capillary cpacity of soil with water absorbing resin and wheatstraw and black veil multiple has growed 35.97%, soil with water absorbing resin and wheatstraw and white veil multiple 35.75%. Soil with water absorbing resin and wheatstraw dual mulch has growed 34.09%, black veil and wheatstraw dual mulch 34.17%, white veil and wheatstraw dual mulch 33.98%, soil with water absorbing resin and black veil dual mulch 30.64%, soil with water absorbing resin and white veil mulch 31.63%. Black veil mulch has growed 28.24%, white veil mulch 27.21%, wheatstraw mulch 27.13%, soil with water absorbing resin 28.28%, contrast 27.13%. From the second year to fourth year,soil saturated water content grow fastly, about 47% of value added. Analysis of variance soil maximum capillary cpacity and saturated soil water content was Sig.=0.000<0.05.3. Soil bulk density reduced about 60%-70.66% from the first year to fourth year. Compared with contrast, soil with water absorbing resin and wheatstraw and black veil multiple of soil bulk density in the 7th year has reduced 12.50%, soil with water absorbing resin and wheatstraw and white veil multiple 11.72%, black veil and wheatstraw dual mulch 10.16%, white veil and wheatstraw dual mulch 10.16%, soil with water absorbing resin and black veil dual mulch 9.37, soil with water absorbing resin and white veil mulch 7.03%, soil with water absorbing resin and wheatstraw dual mulch 7.81%, black veil mulch 4.69%, white veil mulch 3.91%, wheatstraw mulch 4.69%. Soil porosity has increased in different water retention covering. Soil with water absorbing resin and wheatstraw and black veil multiple has increased 5.40%, soil with water absorbing resin and wheatstraw and white veil multiple 5.42%, soil with water absorbing resin and wheatstraw dual mulch 5.35%, black veil and wheatstraw dual mulch 5.36%, white veil and wheatstraw dual mulch 5.34%, soil with water absorbing resin and black veil dual mulch 5.33%, soil with water absorbing resin and white veil mulch 5.26%, black veil mulch 5.24%, white veil mulch 5.24%, wheatstraw mulch 5.20%, soil with water absorbing resin 5.19%, contrast 5.07%. Analysis of variance soill soil bulk density and soil porosity was Sig.=0.000<0.01.4. The tree height has growed about 53%-56% from the first year to fourth year. The tree dbh has growed about 72% from the second year to 5th year. The tree individual volume has growed about 73% from the third year to 6th year.Height increment apparent differently from the fourth year. The maximum tree height was in the fourth year. The maximum tree dbh was in the 5th year. The effective in promoting the growth of different water retention covering were multiple treatments > dual treatments > single treatments > contrast. Twelve different water retention coverings has divided into 4 classes: multiple treatments, dual treatments, single treatments, contrast. Analysis of variance them was Sig.=0.001<0.05.5. Dynamic prediction model R2 of height, dbh, individual volume were more than 0.96 in different water retention covering. High point of height was the second year or third year, starting point of high-speed was the first year, and the end point of high-speed was the fourth year or 5th year. High point of dbh was the third year or fourth year, starting point of high-speed was the first year or second year, and the end point of high-speed was the 5th year or 6th year. High point of individual volume was the fourth year or 5th year, starting point of high-speed was the third year, and the end point of high-speed was the 6th year or 7th year.6. T value of measured and simulation on height in different water retention covering was between 0.362 and 0.980, on dbh was between 0.168 and 0.837, on individual volume was between 0.120 and 0.634. Then were more than 0.05.7. Input-output analysis of different water retention covering were soil with water absorbing resin and white veil dual mulch > soil with water absorbing resin and black veil dual mulch >white veil mulch>black veil mulch > soil with water absorbing resin and wheatstraw and black veil multiple treatments > soil with water absorbing resin and wheatstraw and white veil multiple treatments > soil with water absorbing resin > white veil and wheatstraw dual mulch> black veil and wheatstraw dual mulch > soil with water absorbing resin and wheatstraw dual mulch > wheatstraw mulch> contrast.Annual profit were more than 12645.56 element per hectare each year. Profit margin of capital were more than 376.66 element based on 100 element.Net present value ratio were more than 3.77, between 4.76 and 5.67.更多还原