共查询到18条相似文献,搜索用时 234 毫秒
1.
2.
以元谋干热河谷几种适应性强、生长快、薪材产量高、热值高的能源林树种为研究对象,在调查树种生态适应性基础上,比较了不同整地方式对造林效果的影响,同时对不同树种薪炭材产量和热能潜力进行比较分析。结果表明:元谋盆地为代表的金沙江干热河谷培育农村能源林,最适宜树种是赤桉(泰)、柠檬桉、赤桉、尾叶桉、新银合欢等,局部水肥条件好的地方可以选种大叶相思、马占相思等树种;这些树种均以撩壕整地的造林效果好于块状整地;各树种生物量及固定太阳辐射能的能力均以赤桉(泰)、柠檬桉、尾叶桉、赤桉和新银合欢较高。提出了在金沙江干热河谷地区培育农村能源林,应该选择赤桉、柠檬桉、尾叶桉和新银合欢等树种,采用容器育苗、撩壕整地、追施有机基肥、雨季初期取苗造林等综合配套的营造林技术。 相似文献
3.
4.
通过石蜡切片和显微测量,研究了云南省红河州石漠化治理树种属内种间叶的结构及抗旱性的差异。结果表明:松属有2个指标存在差异,即表皮厚(马尾松-加勒比松〉细叶云南松)和下皮厚(加勒比松〉细叶云南松〉马尾松);柏木属有2个指标存在差异,即总厚度和上表皮厚(均为墨西哥柏〉冲天柏);按属有4个指标存在差异,即上角质层厚、下角质层厚、栅栏组织厚(均为赤桉〉直干桉)和海绵组织厚(赤桉〈直干桉);金合欢属有6个指标存在差异,即总厚度、上表皮厚、下表皮厚、腹侧栅栏组织厚、背侧栅栏组织厚和贮水组织厚(均为肯氏相思〉大叶相思)。因此,如果仅从叶的结构来比较抗旱性,则松属中加勒比松〉马尾松〉细叶云南松;柏木属中墨西哥柏〉冲天柏;桉属中赤桉〉直干桉;金合欢属中肯氏相思〉大叶相思。 相似文献
5.
2004-2005年以“三个效益”为标准,对元谋县金沙江干热河谷区引种栽培的树种进行了调查,结果认为引种是成功的,以用材为主的生态林树种为:加勒比松、赤桉、柠檬桉、尾叶桉、苏门答腊金合欢、新银合欢、大叶相思;以林果为主的经济林树种为:毛叶枣、龙眼、芒果、甜酸角。木豆和山毛豆可作为木本饲料种植。 相似文献
6.
2004~2005年以"三个效益"为标准,对元谋县金沙江干热河谷区引种栽培的树种进行了调查,结果认为引种是成功的, 以用材为主的生态林树种为加勒比松、赤桉、柠檬桉、尾叶桉、苏门答腊金合欢、新银合欢、大叶相思;以林果为主的经济林树种为毛叶枣、龙眼、芒果、甜酸角.木豆和山毛豆可作为木本饲料种植. 相似文献
7.
8.
9.
在海南半干早丘陵台地区,对窿缘桉、大叶相思、木麻黄、新银合欢、银合欢、刚果12号桉和雷林1号桉进行了筛选试验,结果表明:刚果12号桉、雷林1号桉、窿缘桉和大叶相思适应性强,生长快,生物量高,燃烧性能好,经济效益高,是适于当地生长和发展的优良薪材树种。 相似文献
10.
通过对10个树种1-4年生的保存率、风害状况、林木生长表面的对比研究,运用模糊综合评判,选择的胶园防护林树种。初步结果表明,赤桉、细叶桉、刚果12号桉适宜作为园防护林更新树种,山地木麻黄和大叶相思亦较适宜,其余树种均不适宜。 相似文献
11.
The accumulation of free
proline in some major tree species growing in dry and hot river valley of Jinsha during
both dry and rainy seasons has respectively been determined.The result shows that the free
proline content in Acacia manguim,Tephrosia
candida,A.podalyriifolia,A.auriliformia,A.confusa,A.holosericea and Dodonaea viscosa
increased significantly than in any other species in dry season.No observable changes have
been found as for the content of free proline in Eucalyptus camaldulensia,E.camaldlensia
from Thailand,E.citriodora,E.urophylla,E.robusta,Leucaena leucocephala,Acacia
glauca,Zizyphus mauritiana in both seasons.There is not obvious interrelation between the
accumulation of free proline and drought resistance in the plants whether among different
species,or among the same tree species from different area,or from different ecological
forms.It seems that there is certain limitation to utilize the content of free proline as
the indices as plant drought resistance.However,using the free proline as indices or
parameter to determine the physiological change in some plants under water stress is
suggested. 相似文献
12.
对金沙江干热河谷区8个造林树种的有关生理生态特性进行了研究。结果表明:相思类树种在旱季水分自然饱和亏缺较大,乡土树种坡柳和3种桉树则是雨季水分亏缺较大,具有WSD高而RWC低的植物同样具有很强的抗旱能力;比叶面积增大是植物提高抗旱能力的一个表现方面,但增加干物质积累、提高细胞质浓度也是途径之一;干热逆境可造成叶绿素含量降低,雨季叶绿素含量有较大提高,叶绿素a/b值也随之得到提高;参试树种的糖分含量旱季比雨季高,除马占相思外,其它树种淀粉与糖的比率则旱季比雨季低;在干热逆境胁迫下,7个树种(除尾叶桉)的游离脯氨酸含量有不同程度增加,旱季植株易出现萎蔫现象,有部分或较多叶片脱落的树种积累的游离脯氨酸较多。除造林效果较差的马占相思与其它7个树种有较多差异外,造林效果较好的7个树种在生理生态变化方面有较多相似性;同时,同类树种间有明显的一致性;乡土树种坡柳则在某些方面更近似于相思类树种,在某些方面又近似于桉树类树种;除马占相思外,3个相思类、3个桉树类树种与乡土树种坡柳同样在金沙江干热河谷区表现出较强的生态适应性。 相似文献
13.
Janusz Zwolinski 《中国林学(英文版)》2006,8(4):37-42
Acacia karroo is an indigenous, strong drought-tolerant and widely planted tree in South Africa. In order to match the plant with its adaptation to forest sites in China, it is important to know the drought-tolerance of this species under Chinese forest site conditions. Our study was carried out in cinnamon soils in Beijing and with Platycladus orientalis, the most drought-tolerant tree in Beijing, as control. Physiological parameters of young plants of the trees were measured and divided into three groups in response to soil drying. The first group included root activity, ABA content in roots and peroxidase (POD) activity in leaves. Their values changed similarly to those of P. orientalis and dramatically increased to maximum values when the soil water content (SWC) decreased from its normal level of 20% to 7.6% where the three indices decreased dramatically when SWC was reduced further from 7.6%. The second group of parameters included the contents of proline, soluble protein and malondialdehyde (MDA). Their values showed greater variation than those of P. orientalis and significantly increased when SWC decreased from 20% in response to soil drying. However, the proline and soluble protein contents fluctuated in A. karroo at a lower level than those in P. orientalis. In contrast, the content of MDA in A. karroo was much higher than that in P. orientalis which almost did not increase in the drying soil. The third group of parameters consisted of soluble sugar, superoxide dismutase (SOD) and catalase (CAT). These parameters showed greater diversity and fluctuations among the three varieties of A. karroo compared with the control in response to soil drying. These results suggest that A. karroo is characterized as a strong, drought tolerant species in most of physiological parameters but weaker than P. orientalis in membrane lipid antioxidation. 相似文献
14.
15.
16.
D. Craven D. DentD. Braden M.S. Ashton G.P. BerlynJ.S. Hall 《Forest Ecology and Management》2011,261(10):1643-1653
Relative to closed-canopy tropical forests, tree seedlings planted in open grown areas are exposed to higher light intensity, air temperatures, vapor pressure deficit, and greater seasonal fluxes of plant available water than mature tropical forests. The species-specific adaptive capacity to respond to variable precipitation and seasonality in open grown conditions, therefore, is likely to affect species performance in large-scale reforestation efforts. In the present study, we compared the photosynthetic characteristics of eight tropical tree species within and between seasons at two study sites with contrasting dry season intensities. All species except Pseudosamanea guachapele reduced leaf physiological function between the wet and dry seasons. The contrasting severity of seasonal drought stress at the study sites constrained growth rates and photosynthetic characteristics differently. Variation of photosynthetic characteristics at the species level was high, particularly in the dry season. Faster growing species at the less seasonal site, Terminalia amazonia, Inga punctata, Colubrina glandulosa, and Acacia mangium, exhibited a greater adaptive capacity than the other species to down-regulate leaf photosynthesis between seasons. As the dry season was more severe at the more seasonal site, most species strongly reduced physiological function regardless of relative growth rates, except two species (Tectona grandis and P. guachapele) with widespread distributions and relatively high drought tolerance. Our results underscore the need to consider seasonal drought tolerance when selecting tree species for specific reforestation sites. 相似文献
17.
相思树种在沿海沙地不同立地环境中的应用效果 总被引:3,自引:0,他引:3
通过测定生长量和抗风性能等指标,研究了厚荚相思、马占相思、大叶相思、纹荚相思等树种在沿海后沿沙地、木麻黄基干林带采伐迹地、风口困难立地等不同立地环境中的应用效果。结果表明:厚荚相思、纹荚相思和马占相思等3个树种为适宜在沿海后沿沙地上生长的相思树种,它们的树高年平均生长量大于1.0 m.a-1,胸径年平均生长量大于1.0 cm.a-1;厚荚相思生长快,林分郁闭早,抗风能力强,具有较强的固氮能力,是一个基干林带更新较为理想的树种;厚荚相思对沙荒风口大风、流沙和严重干旱等恶劣生境适应性较强,生长最大,是风口困难立地造林的可取树种。 相似文献
18.
水分胁迫下刺槐不同无性系生理生化反应的研究 总被引:26,自引:0,他引:26
Water stress can cause all kinds of physiological and biochemical responses on forest tree, which are indicated by changes of many physiological and biochemical indexes. Under the different drought extent of soil, the seedlings of Rob-inia pseudoacacia clones were tested. Testing indexes included water content, the ratio of bound water content and free wa-ter content ( Vα/Vs), free proline, soluble sugar, soluble protein ect. The results showed that water content decreased with the increase of soil drought, the rest indexes increased in different extent. The range of variance differed among clones. It was difficult to evaluate exactly the drought resistance of different clones depending on only physiological and biochemical index. 相似文献