Báo cáo lâm nghiệp: " The use of ultrasonic detectors for water stress determination in fruit trees" docx

... in Thuja occidentalis L.? Ultrasonic acoustic emissions from the sapwood can be measured. Plant Physiol. 72, 1094-1099 The use of ultrasonic detectors for water stress determination ... reduction in hydraulic conductivity could occur. Work is continuing in order to evaluate the technique for assessing plant responses to drought in th...

Ngày tải lên: 09/08/2014, 04:20

... (http://www.pisky.cz) was used in laboratories of the North-Bohemian Museum in Liberec and later also of the Botanic Gardens in Liberec. I consider the following properties as the principal advantages of the described ... favourably in uenced by the actual determination of the acidic environment dur- ing the hydrolysis of agar. e following experiment or...

Ngày tải lên: 07/08/2014, 03:22

... average depth of entry holes was bigger on trees which were less stressed by a lack of water. e exact mechanism of these relationships between the water stress and the increase of tree resistance ... is to analyze the behaviour of bark beetles on trees under various regime of water stress in declining spruce mono- cultures. Within the frame of which we...

Ngày tải lên: 07/08/2014, 03:22

... competitive in comparison with non-irradiated males in these parameters. Competition for females As the results indicate, the number of mother tun- nels was the highest in the case of 15 Gy irradiated ... shortly prior to the beginning of rearing. Number and sex ratio of the F1 offspring were not identified in this study, because of the low number of emerg...

Ngày tải lên: 07/08/2014, 03:22

... practices aimed at the reconstruction of local mountain forests was the inconsiderate use of bulldozer technologies for the preparation of sites for forest stand restoration. In the course of large-scale ... complete spreading of former line windrows was done there for soil re- vitalization (V 2003). Before the windrow spreading started, the windrows...

Ngày tải lên: 07/08/2014, 03:22

... km in the E-W direction in the eastern part to 12 km in the N-S direction in the southern part. It is signifi- cantly prolonged in the N-S axis, as a result of the in- tensive spreading of bark ... driven decline is typical of the Kysuce and Orava regions. In the Orava region, the decline was accelerated by windstorm in 2004, causing heavy damage to fo...

Ngày tải lên: 07/08/2014, 03:22

... an increase in cutting speed, when the rise is the most intensive above 30 ms –1 ; an increase in the value of the rake angle causes a decrease in cutting input. So, with regard to the ... difference. Measuring of cutting input At experimental measurements of cutting input the common principle of measurement was used based on monitoring changes in the curre...

Ngày tải lên: 07/08/2014, 03:22

... decreasing dominance (Table 2). The result of CCA analysis showed the condi- tion convenience for the existence of some weevil species in the researched AZ. In the case of the 3 rd AZ the canonical ... cumu- lative variance of the data together (Fig. 1). It is also obvious in the declining character of the ratio of the researched species in inv...

Ngày tải lên: 07/08/2014, 03:22

... overlooked in mountain spruce forests in the Tatra Mountains and, possibly in other mountain areas in Europe too. In the study area, the bark beetle acts as a vector of at least four species of uropodine ... from 0.064 in the valley Bielovodská dolina to 0,108 in Tomanova dolina and 0.145 in Velická dolina, giv- ing the value of 0.103 for the study are...

Ngày tải lên: 07/08/2014, 03:22

... projected against EIV for the moisture of the given species. e fitting of the resulting field of points shows a shift in the species composition of the herb layer. e relation of the species ... factors is the height of the water table. The changing character of some of the sites due to its fluctuation may result in increasing space available fo...

Ngày tải lên: 07/08/2014, 03:22