Báo cáo lâm nghiệp: "Physiological responses to air pollutants" potx

... with air pollutants. According to Levitt (1980), two strategies can be distinguished: avoid- ance and tolerance. While avoidance stra- tegies include the cuticle and the stomata, tolerance ... lead to re- latively severe damage to trees, especially under unfavorable weather conditions and shortening of the vegetation period. The stomata can play...

Ngày tải lên: 09/08/2014, 04:20

... enzymes in photosynthetic carbon reduction cycle and/or a restriction of photophosphorylation. The irreversible effect is thought to be due to an injury to the thylakoid ... original location to new areas. Low summer temperature has been suggested to be a limiting factor for distri- bution of several vascular plants in Scan- dinavia, primarily...

Ngày tải lên: 09/08/2014, 04:20

... from –0.96 MPa to –2.22 MPa, indicating probably down-regulation of primary photochemistry and the augmentation of photoprotective mechanisms to avoid overre- duction and photoinhibitory damage ... [10, 22]. Since the frozen storage of spring planted seedlings is usually initiated in October, prolongation would account for a storage period of over 30 weeks. Long storage periods may, howev...

Ngày tải lên: 08/08/2014, 00:21

... significant decline in net photo- synthesis was observed concomitant to reduced stomatal aperture. However, non- stomatal limitations to photosynthesis may also be observed ... other seedling responses in flood-tolerant Alnus japonica and flood-intolerant Betula platyphylla var japonica. Tree Physiol 14, 251-261 Topa MA, McLeod KW (1986) Responses of...

Ngày tải lên: 08/08/2014, 18:21

... for use in biomonitoring. Stomatal structural damage, used as an indicator of atmosphe- ric pollution [50], was also proved to be sensitive to surfactants. The symptomatology of stomatal damage ... Selective solu- bilization of tomato fruit epicuticular wax constituents by Triton X- 100 surfactant, J. Pest. Sci. 26 (2001) 16–20. [48] Townsend A.M., The search for salt tolerant trees, Arbo...

Ngày tải lên: 08/08/2014, 00:22

... large predators produces changes in food chains. In forest stands influenced by human activities the reasonable game management and the regulation of game stock seems to be one of the main tools ... standard stock. e number of wildlife ruminants has to be equalized with food sources in the area. – Feed racks placed close to young forest stands consequently increase damage to near...

Ngày tải lên: 07/08/2014, 04:20

... were cut to determine bending strength (6 specimens in longitudinal direction, 6 in cross direction), 6 to determine density, 6 to determine moisture and in Variant 2, 6 specimens to determine ... from 13.02 kg/m 2 to 14.41 kg/m 2 . CONCLUSION e aim of the paper was to determine properties of newly developed plywood materials combined with cork and fibreglass and to comp...

Ngày tải lên: 07/08/2014, 04:20

... calibration. e disks are placed into the apparatus and the revolution counter is set to zero. e first test specimen is fixed into the holder. It is necessary to ensure that the test specimen ... side has to be worked in parallel with the specimen level (Fig. 2). e speci- men height has to correspond to requirements of a testing machine. If the testing machine does not allow...

Ngày tải lên: 07/08/2014, 10:21

... inventory dates. Growth response of Q. pyrenaica to thinning 247 by diameter classes, due to the lack of height growth response to thinning. Although the same sample of trees was used to measure ... the first inventory (30-years-old) the basal area and biomass removed with thinning are added to standing values to calculat e the total crop of the stand. In the other two inventori...

Ngày tải lên: 08/08/2014, 01:22

... alcohol or raised to the adult stage. RESULTS Cone entomofauna of Swiss stone pine Three phytophagous species were observed to attack the seed cones of Swiss stone pine. The ... abiotic factors during the first year of cone development while cone insects caused most damage to second-year cones. The cone entomofauna only included three phytoph...

Ngày tải lên: 08/08/2014, 18:21