【作者】 郑长焰；

【导师】 李延； 黄毅斌；

【作者基本信息】 福建农林大学 ， 植物营养学， 2007， 硕士

【摘要】 本研究通过砂培试验，研究硫对圆叶决明若干生理代谢和产量、品质的影响，阐明硫在提高圆叶决明产量和品质方面的作用和机理。通过土培试验，研究氮、硫配施对圆叶决明产量和品质的影响，为圆叶决明合理施用氮、硫肥提供依据。主要结论如下：1．施硫可促进圆叶决明的生长，表现为株高、各级分枝数、分枝长以及生物量的显著提高，但当营养液硫浓度达到或超过0.500mmol／LSO₄^2-时，圆叶决明的株高、各级分枝数、分枝长以及生物量下降。2．施硫可提高圆叶决明的Chla、Chlb、Car和Chla+b的含量，Chla／Chlb比值提高，营养液硫浓度超过0.50mmol／L SO₄^2-时，光合色素含量随供硫浓度的增加而逐渐降低。3．硫影响圆叶决明的氮代谢，表现为硫可提高圆叶决明的硝酸还原酶活性，降低NO₃^--N含量。缺硫胁迫会导致圆叶决明蛋白氮含量降低，非蛋白氮含量提高，蛋白氮／全氮比值下降。4．硫素营养对圆叶决明的品质有促进作用。施硫可提高圆叶决明的粗蛋白、粗脂肪、粗灰分和磷的含量，降低木质素、单宁以及中性洗涤纤维、酸性洗涤纤维的含量。此外，供硫还降低了圆叶决明的茎叶比，提高圆叶决明的营养价值。5．圆叶决明硫素营养诊断的适宜采样部位是叶片，叶片全硫含量的适宜范围为0.29％～0.67％。6．氮、硫配施与单施氮肥相比，有利于提高圆叶决明的茎高、各级分枝数、各级分枝长以及生物量。施硫量相同的情况下，增施氮肥可以提高圆叶决明的生物量。氮、硫配施还可提高圆叶决明的品质，与单施氮肥相比，氮、硫配施提高了圆叶决明的粗蛋白、粗脂肪含量；降低了木质素、单宁、NDF、ADF含量。7．综合比较不同氮、硫配施处理圆叶决明的生物量和营养品质，可以得出，圆叶决明生长适宜的叶片N／S比值为8～9。更多还原

【Abstract】 The research used the sand culture to study the effect of sulphur on some physiological metabolisms, yield and quality of chamecrista rotundifolia , aimed at showing the effect and the mechanism of sulphur on yield and quality of chamecrista rotundifolia. Soil culture was used to study the effect of sulfur and nitrogen fertilizer combined application on yield and quality of chamecrista rotundifoliam, aimed at offering the theory basis on the rational application of sulfur and nitrogen fertilizer. The main results are as follows.1 Application sulphur significantly stimulated plant height, number of branches, length of branches and biomass of. chamecrista rotundifolia. When the S concentration （?）0．500mmol /LSO₄^2- in nutrient solutions, plant height, number of branches, length of branches and biomass of. chamecrista rotundifolia decreased.2 Sulphur application increased the contents of chlorophyll a, chlorophyll b, carotene, chlorophyll（a+b） and the ratio of chlorophyll a to chlorophyll b. When the S concentration （?）0．500mmol /L SO₄^2- in nutrient solutions , the contents of the photosynthetic pigment decreased as the S concentration increased.3 Sulphur application enhanced the activity of nitrate reductase and decreased the contents of NO₃-N. Sulphur deficiency could decrease the contents of protein nitrogen and the ratio of protein nitrogen to total nitrogen, while increased the contents of non-protein nitrogen .4 Sulphur application increased the contents of crude protein, fat, ash and phosphorus, while decreased the contents of tannin, ADF, NDF and lignin in stem and leaves. In addition, Sulphur application also decreased ratio of stem to leaves, enhanced the nutritional value of chamecrista rotundifolia.5 The proper organ for chamecrista rotundifolia sulfur diaganosis is leaves. Total sulfur could be used for sulfur diagnosis and the suitable ranges was 0．29%～0．67%. 6 Compared with apply of nitrogen alone, combined application of nitrogen and sulphurincreased plant height, number of branches, length of branches and biomass of. chamecrista rotundifolia. With the equal quantity of sulphur application,the biomass of. chamecrista rotundifolia increased by increasing nitrogen supply. Combined application of nitrogen and sulphur also increased the contents of crude protein, fat, while decreased the contents of tannin, ADF, NDF and lignin in chamecrista rotundifolia.7 The preliminary study suggested the optimum ratio of chamecrista rotundifolia leaves’ nitrogen to sulphur was 8～9．更多还原