【作者】 程鹏；

【导师】 曹福亮；

【作者基本信息】 南京林业大学 ， 森林培育， 2010， 博士

【摘要】 人工复合经营的理论与实践,已显示出强大的生命力。以银杏(Ginkgo biloba L.)为主的林农复合经营模式是全国分布较广、认可程度较高的林农复合系统类型。为全面探讨不同银杏复合经营模式的生态和经济效应,本文在综述了国内外林农复合经营研究进展的基础上,以江苏省泰兴市平原区不同年份栽植(1994、2004)的七种银杏林农复合经营系统以及对照,即银杏+油菜+花生(G+R+S)、银杏+小麦+花生(G+W+S)、银杏+蚕豆+花生(G+B+S)、银杏+桑树(G+M)、小麦+花生(W+S)、油菜+花生(R+S)和银杏(G)等,并辅之安徽省潜山县大别山区银杏+板栗+茶(G+C+T)、板栗+茶(C+T)、纯茶(T)模式为研究对象,对其小气候特征、光合特性、土壤肥力、营养输入和输出、生物生产力及目标收获物品质等进行了系统的研究,并采用数学方法对不同银杏复合经营系统的生态与经济效应进行了综合评价,主要研究结果表明:(1)不同复合经营系统中光照强度、气温、地表温度等的日变化在一年中各个季节基本上呈现出“低-高-低”的变化趋势,而空气相对湿度的日变化呈现出“高-低-高”的变化模式;银杏复合经营系统内表现为冬季林内光照强度下降幅度小,春季和夏季林内光照强度下降幅度较高的趋势;银杏复合经营在冬季能够有效地增加了林内温度、地表温度,降低空气湿度,在生长季节能够有效地降低气温和地表温度,增加空气湿度;银杏复合经营能够明显降低风速的同时,也降低了土壤的含水量。(2)不同复合经营系统中,以及同一复合经营系统土壤不同层次中土壤的pH、有机质、全氮和水解氮、有效磷、全钾、有效钾、过氧化氢酶、多酚氧化酶、蔗糖酶、脲酶、脱氢酶、磷酸酶和蛋白酶等均存在着显著差异;采用改进层次分析法对土壤肥力综合评价表明,不同复合经营模式土壤综合肥力差异较大,其泰兴各模式土壤肥力质量指数(FI)从高到低依次为94G+M模式(FI=0.684)>04G+M模式(FI=0.574)>94G+B+S模式(FI=0.563)>04G+W+S模式(FI=0.506)>94G+R+S模式(FI=0.505)>04G+R+S模式(FI=0.466)>W+S模式(FI=0.454)>94G+W+S模式(FI=0.442)>R+S模式(FI=0.434)>94G模式(FI=0.287),潜山3种经营模式土壤肥力质量指数从高到低依次为G+C+T模式(FI=0.746)>C+T模式(FI=0.557)>T模式(FI=0.453)。可见,复合经营土壤肥力要优于单作模式。(3)银杏复合经营系统提高了银杏根和茎中氮、磷、钾、镁的含量,而使叶中的氮、钙、镁及根、茎中钙含量下降;林农复合经营系统降低了小麦植株中氮、磷、钾的含量,以及花生中的氮、钾含量及地上部分钙含量,而小麦中镁含量,花生中磷、镁含量及地下部分的钙含量升高;94G+R+S、94G+M和94G+W+S系统增加了对营养元素的吸收、营养元素的归还量和取走量,提高了营养元素的循环率,而94G+M、W+S降低了营养元素的循环率。(4)不同复合经营系统单位面积总生物量和目标收获物产量达到显著差异水平,94G+W+S模式年总生物量和目标收获物产量最高,94G模式最低;与对照相比,复合经营系统中,银杏年生长量和种子产量均有不同程度的提高,而间作物的年生长量和目标收获物显著下降;复合经营系统中,主要间作物的年生物量均高于银杏的年生物量,依次为小麦>桑树>油菜>花生>银杏>蚕豆,而各种植物的生产力高低排列顺序与生物量略有不同,其次序为小麦>油菜>花生>桑树>银杏>蚕豆。潜山G+C+T、C+T模式内茶树的生物生产力显著低于T模式,但茶叶的水浸出物、咖啡碱、茶多酚、氨基酸、镁、锰等含量在复合模式中要高于纯茶模式。(5)不同复合经营系统的固碳价值、土壤保育价值、空气净化价值等生态价值均存在较大的差异。生态总价值以94G+M模式最高,达1.979万元·hm-2·a-1,94G+R+S模式(1.477万元·hm-2·a-1)和94G+W+S模式(0.939万元·hm-2·a-1)次之,94G模式(0.526万元·hm-2·a-1)和W+S模式(0.241万元·hm-2·a-1)最低;复合经营系统的经济效益在整体上要好于纯林和纯农模式,5种模式的经济效益高低顺序为94G+W+S模式(4.486万元·hm-2·a-1)>94G+R+S模式(3.696万元·hm-2·a-1)>94G+M模式(2.891万元·hm-2·a-1)>94G模式(2.169万元·hm-2·a-1)>W+S模式(2.047万元·hm-2·a-1);在生态经济综合效益方面,94G+W+S模式的综合效益最高,达5.425万元·hm-2·a-1,其次为94G+R+S模式(5.173万元·hm-2·a-1)、94G+M模式(4.870万元·hm-2·a-1)、94G模式(2.695万元·hm-2·a-1),W+S模式最低(2.288万元·hm-2·a-1)。综上所述,银杏林农复合经营系统要优于纯银杏和纯农作物栽培经营。在不同银杏复合系统中,由于复合植物的不同造成各模式生态、经济效应的差异,具体表现为:从土壤肥力角度分析,G+M、G+R+S模式优之;从养分吸收与循环角度分析,G+R+S、G+W+S模式优之;从生物量与生产力角度分析,G+W+S、G+R+S模式优之;从经济效益角度分析,G+W+S、G+R+S模式优之;从生态效益角度分析,G+M、G+R+S模式优之。在综合社会、经济、生态效益及结合劳力机会成本与产出等情况分析,在农区可首先推广应用G+R/W+S银杏复合经营系统,而在山区及丘陵区可首先推广应用G/C+T、G+M银杏复合经营系统。更多还原

【Abstract】 The theory and practice of agroforestry, which has performed the powerful vitality, provides the effective approaches for realizing forestry ecological construction and harmonious development of forestry and agriculture. The Ginkgo agroforestry is popular to be distributed and accepted at the zone of Ginkgo cultivation. For comprehensively probing into the ecological and economical effects of Ginkgo agroforestry systems, based on the domestic and overseas study achievements, the paper studied the principal agroforestrys of the seven Ginkgo agroforestrys planted in years 1994 and 2004, monotypic Ginkgo and monotypic crop in the plain areas in Taixing Jiangsu, i.e. Ginkgo+Rape+Peanut (G+R+S), Ginkgo+Wheat+Peanut (G+W+S), Ginkgo+Broadbean+Peanut (G+B+S), Ginkgo+Mulberry (G+M), Wheat+Peanut (W+S), Rapeseed+Peanut (R+S) and monotypic Ginkgo (G), and further supplementary agroforestry systems of Ginkgo+ Chestnut+Tea (G+C+T), Chestnut+Tea (C+T) and monotypic Tea (T) in the areas of Mt.Dabie in Qianshan Anhui. The paper systematically probed the micro-climate character, photosynthesis characteristics, soil fertility, nutrition inputting and outputting, biological productivity, and quality of target harvest products, etc. And the paper used mathematic ways to comprehensively evaluate the ecological and economic effects of Ginkgo agroforestry systems. The main results were as follows:I. The daily change of light intensity, air temperature and soil surface temperature basically presented the Low-High-Low tendency in various agroforestry systems all the year, while the daily change of the atmosphere relative moisture presented the High-Low-High tendency. Ginkgo agroforestry systems presented that the forest interior light intensity was decreasing with small amplitude in winter, but decreasing with big amplitude in spring and summer. Ginkgo agroforestry systems could obviously keep the thermal preservation in winter through increasing the forest interior temperature, soil surface temperature and decreasing the atmosphere relative moisture. However, Ginkgo agroforestry systems could keep cooling the atmosphere temperature, soil surface temperature and increasing the atmosphere relative moisture in the growth seasons. On one hand, the Ginkgo systems could obviously reduce the wind speed, on the other hand, the soil water content becomed less.II. In different agroforestry systems or the same agroforestry systems along with the different depths of soils, all these (the contents of the soil oganic matters, total-N, hydrolysable N, total-P, available P, available K and the activity of sucrase, urease, dehydrogenase, phosphatase and protease) were violently different. The study comprehensively evaluated the soil fertility and quality in various models through the procedures of the improved analytic hierarchy process. The High-Low order of the soil fertility and quality in various models was 94G+M(FI=0.684)>04G+M(FI=0.574)>94G+B+S(FI=0.563)>04G+W+S(FI=0.50)>94G+R+S (FI=0.505)>04G+R+S(FI=0.466)>W+S(FI=0.454)>94G+W+S(FI=0.442)>R+S(FI=0.434)> 94G (FI=0.287) in Taixing, while G+C+T(FI=0.746)>C+T(FI=0.557) T(FI=0.453) in Qianshan. The study showed that the soil fertility is better in agroforestry systems than in monotypic models.III. Ginkgo agroforestry systems increased the contents of N, P, K and Mg in Ginkgo roots and stems, but decreased the contents of N, Ca and Mg in Ginkgo leaves and Ca in Ginkgo roots and stems. Agroforestry systems reduced the contents of N, P and K in Wheat, and the contents of N and K in the underneath part of Peanut and Ca in the overground part of Peanut. But the agroforestry systems increased the contents of Mg in Wheat and the contents of P, Mg and Ca in Peanut. The models 94G+R+S, 94G+M and 94G+W+S increased the ability for the absorption, return and taking amount of the nutrition elements, which increased the Circulation Ratio of the nutrition elements, but the models 94G+M and W+S decreased the Circulation Ratio.IV. The total biomass quantity and the target harvest yield were remarkably different among various agroforestry systems. Compared to the no-touch plots, the annual growth and the seeds yield of Ginkgo incresed to some extent, however, the annual biomass growth and the target harvest products of the intercrops decreaed obviously. In agroforestry systems, the total of the annual biomass of the main intercrops was more than that of Ginkgo, and the High-Low order was Wheat>Mulberry>Rape>Peanut>Ginkgo>Broadbean. However, the High-Low order of productivity was Wheat>Rapeseed>Peanut>Mulberry>Ginkgo>Broadbean, which was a little bit different than that of the biomass amount. The tea biological productivity in the models of G+C+T and C+T was much lower than that in the model T, but the contents of the tea chemical compositions (waterextraction, caffeine, tea polyphenol, amino acid, Mg, Mn, etc.) were higher than those of the tea monotypic model.V. It existed violent differences on the ecological value including carbon fixation, soil fertility maintenance and air purification, the model 94G+M had the highest total benefits, which was 19790 yuan·hm-2·a-1, and the following was the models 94G+R+S(14770 yuan·hm-2·a-1)and 94G+W+S)(9390 yuan·hm-2·a-1), and the lowest was the models 94G(5206 yuan·hm-2·a-1) and W+S(2410 yuan·hm-2·a-1). The economic benefit of agroforestry systems were generally better than that of pure forest or agriculture. The High-Low order of the economic benefit was 94G+W+S(44860 yuan·hm-2·a-1)>94G+R+S(36960 yuan·hm-2·a-1) >94G+M(28910 yuan·hm-2·a-1)>94G (21690 yuan·hm-2·a-1)>W+S (20470 yuan·hm-2·a-1). On the ecological value, the High-Low order was that the highest was the model 94G+W+S(54250 yuan·hm-2·a-1), the following was the models 94G+R+S(51730 yuan·hm-2·a-1), 94G+M(48700 yuan·hm-2·a-1) and 94G(26950 yuan·hm-2·a-1), the lowest was the model W+S(22880 yuan·hm-2·a-1).As the conclusion, Ginkgo agroforestry systems were superior to monotypic Ginkgo or crops cultivation. Different Ginkgo agroforestry systems had different ecological and economic benefits because of the different plants combinations. When soil fertility was considered, the models G+M, G+R+S were superior; when absorption and cycling of nutrition elements were considered, the models G+R+S, G+W+S were superior; when biomass and productivity were considered, the models G+W+S, G+R+S were superior; when economic benefits were considered, the models G+W+S, G+R+S were superior; when ecological benefits were considered, the models G+M, G+R+S were superior. Based on the comprehensive analysis of social, economic and ecological benefits, cost and output, etc., the models G+R/W+S could be promoted in rural areas, while the models G/C+T, G+M could be promoted in the mountains .更多还原