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本文研究了在相同环境条件下,无性系GT1、RRIM600和云研277—5正常树与褐皮病树胶乳的硫醇、抗坏血酸和A—乳清蛋白质的含量。结果表明,三个无性系正常树胶乳的硫醇、抗坏血酸和A—乳清蛋白质的含量均高于死皮树的。经t测验,GT1的硫醇含量达极显著,云研277—5达显著,RRIM600不显著;抗坏血酸的含量在GT1和云研277—5中达显著,而RRIM600达极显著;A—乳清蛋白质的含量除RRIM600未达显著外,其余二个无性系均达显著。 相似文献
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<正> 通常认为褐皮病是一种由于过度割胶而引起的生理失调。虽然这种生理失调对胶树本身无害,但因此而造成的减产则关系到植胶者的利益。此外,褐皮病是确定割胶强度,由此间接决定产量的一个重要因素。 症状 生理失调初期阶段的特征是部分或全部割线不排胶。常常可以发现,由于死皮只限于一部分乳管列,所以,整条割线还在出胶。在死皮伴随出现褐色斑点的时 相似文献
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<正>凡割胶后割线局部或全部停止排胶的现象习惯上统称死皮。死皮的种类很多,对产胶影响最大,扩展最快的主要是褐皮病型死皮。随着开割面积的扩大和割龄的增长,死皮越来越突出了,据西双版纳农垦分局一九八一年统计死皮停割8.6%,约25万株,如以株产3公斤计算,年损失干胶750吨,价值435万元。打洛五分场至一九八一年累计死皮7.8%,六分场3%,有的林 相似文献
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通过对国外橡胶树优良品种IAN873在西双版纳24年适应性观察研究,结果表明:该品种生长快,开割前年均增粗5.65cm,高于对照RRIM600(5.06cm)10.67%;林相整齐,开割时平均茎粗50.5cm,开割率80.2%,分别比对照高2.8cm和10.4%;产胶量中等,1-16割年平均干胶产量1 310kg/hm2,为对照RRIM600(1 969kg/hm2)的66.55%;年平均单株产量为4.0kg,略低于对照RRIM600(4.2kg/年.株)0.2kg;抗辐射寒害能力中等偏下,抗寒力小于GT1,但较RRIM600强;耐割性强,割胶16年后死皮发病率为15.79%,病指14.95,分别比对照(28.79%、27.58)轻13个百分点和12.63。 相似文献
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《热带农业科技》2021,(4)
对1992年种植的云研系列9个品种在高级试验系比的观察结果表明,生长量较对照RRIM600高的是云研73-477,20龄树150 cm处平均围茎74.2 cm,为对照RRIM600的106.9%,生势中等,其余品种均较对照生长慢;产量较高的是云研76-235、云研80-1983、云研78-768,11割年平均单株产胶量分别为4.5、4.4、4.3 kg,为对照RRIM600的137.4%、134.2%、130.7%;参试的9个品种死皮均较对照RRIM600重,为不耐刺激割胶品种;抗寒性方面,除云研73-477与对照GT1相当,属中等抗寒品种外,其余品种均比对照RRIM600弱,为不抗寒品种。 相似文献
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1—6割龄RRIM600不同割胶制度比较试验的结果表明,1—3割龄以采用s/2d/3割制,4割龄后转为s/2d/2割制为好。胶树茎围增长快,死皮轻,后期产量也高。 相似文献
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The potential for increasing rubber production by matching tapping intensity to leaf area index 总被引:1,自引:1,他引:0
Understanding resource capture can help design appropriate species combinations, planting designs and management. Leaf area index (LAI) and its longevity are the most important factors defining dry matter production and thus growth and productivity. The ecophysiological modifications and yield of rubber (Hevea spp.) in an agroforestry system (AFS) with beans (Phaseolus vulgaris L.) were studied. The experiment was established in Southeast-Brazil, with three rubber cultivars: IAN 3087, RRIM 600 and RRIM 527. The AFS comprised double rows of rubber trees along with beans sown in autumn and winter seasons in 1999. There was about 50% higher rubber yield per tree in the AFS than the rubber monoculture. Trees within the AFS responded to higher solar radiation availability with higher LAI and total foliage area, allowing its greater interception. All three cultivars had higher LAI in the AFS than monoculture, reaching maximum values in the AFS between April and May of 3.17 for RRIM 527; 2.83 for RRIM 600 and 2.28 for IAN 3087. The maximum LAI values for monocrop rubber trees were: 2.65, 2.62 and 1.99, respectively, for each cultivar. Rubber production and LAI were positively correlated in both the AFS and monoculture but leaf fall of rubber trees in the AFS was delayed and total phytomass was larger. It is suggested that trees in the AFS were under exploited and could yield more without compromising their life cycle if the tapping system was intensified. This shows how knowledge of LAI can be used to manage tapping intensity in the field, leading to higher rubber yield. 相似文献
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