Báo cáo lâm nghiệp: " Optimising the management of uneven-aged Pinus sylvestris L and Pinus nigra Arn mixed stands in Catalonia, north-east Spain" pps
Báo cáo lâm nghiệp: "Optimising the management of even-aged Pinus sylvestris L. stands in Galicia, north-western Spain" ppt
... ro-tation length (R) – Age of initial stand)/ (Number of thinnings + 1)):− Year of the first thinning: (Age of initial stand, Age of initial stand+ 2I);Optimal management of Pinus sylvestris in Galicia ... MATERIALS AND METHODS The stand level offers the first meaningful level of decision mak-ing, and the results obtained for the stand level management can beused as guidelines in forest level planning ... thinningintensity depends on the number of the thinning, the intensityincreasing from the first thinning to the fourth. The intensity of the first thinning is around 20% of basal area, and in the...
- 12
- 296
- 0
Báo cáo lâm nghiệp: " Optimising the management of uneven-aged Pinus sylvestris L. and Pinus nigra Arn. mixed stands in Catalonia, north-east Spain" pps
... 747–758© INRA, EDP Sciences, 2005DOI: 10.1051/forest:2004071Original article Optimising the management of uneven-aged Pinus sylvestris L. and Pinus nigra Arn. mixed stands in Catalonia, north-east ... initialpoint of 30 out of the 33 direct search runs for each problem. The effect of discounting rate and length of the cutting cycleon the optimal management of mixed stands of P. sylvestris and P. ... mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia (north-east Spain). The simulation sub-system consists of a method for drawing the initial tree diameters from a Weibull distribution and...
- 12
- 412
- 0
Báo cáo lâm nghiệp: "Optimising the management of Pinus sylvestris L. stand under risk of fire in Catalonia (north-east of Spain)" ppsx
... Miina J., Growth and yield model for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain, Ann. For. Sci. 61 (2004) 9–24. [33] Valsta L. , Possibilities ... stand age when the first thinning occurs; years sinceprevious thinning for the other thinnings; remaining basal area.For the final cutting: years since the last thinning to the first regen-erative ... destroyed in Portugal, Spain and southern Italy [28]. The problem isbecoming increasingly serious. The number of fires and the area burned was greater in the 1980s and particularly the 1990s in comparison...
- 9
- 267
- 0
Báo cáo lâm nghiệp:"Optimising the management of Scots pine (Pinus sylvestris L.) stands in Spain based on individual-tree models" potx
... be independent of thinnings. When a thinning is simulated, half of the basal area isremoved equally from all diameter classes, and the other half as a lowthinning, starting with the smallest ... previous thinning, and the remaining stand basal area after each thinning. The system was used to find optimal management schedules of Pinus sylvestris stands on site indices 17, 24 and 30 m (dominant ... 10.1051/forest:2003002Original article Optimising the management of Scots pine (Pinus sylvestris L. ) stands in Spain based on individual-tree modelsMarc Palahía* and Timo Pukkalab a European Forest Institute,...
- 10
- 249
- 0
Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx
... in surroundings of the studied localities since larch lacks.Modele importance of all explanatory variables, their significance and correlations with axes are presented in Fig. 1 and Table ... first canonical axis explains 38.8% of variability, both canonical axes explain 53% of variability (Table 2). All axes explain 100% of vari-ability. e whole model was statistically significant ... at the beginning of June depending on the actual weather. C. alpina flew first, followed by C. erythrogaster and C. arven-sis, the last flying species were C. alashanica and C. bietis. All species...
- 6
- 352
- 0
Báo cáo lâm nghiệp: "About the benefits of poststratification in forest inventories" potx
... independently of the original dis-tribution of the variable of interest. Here, although the estimate of the true mean is unbiased and the variance of the mean decreases (Tables 3 and 4) with increasing ... random sampling (Fig. 6b), gains in precision are only slightly larger. Probably, the little size and spatial distribution of connected areas of the diffe-Sample size (n)Sample size (n)Sample size ... systematic samples of varying size, that is, 64 samples of size 100, 32 of size 110, and 4 of size 121. In sampling a nonrectangular area, variability of the sample size will further be increased...
- 10
- 399
- 0
Báo cáo lâm nghiệp: "Modeling the impact of thinning on height development of dominant and codominant loblolly pine trees" pot
... trees followingthinning.Peterson et al. [10] found that loblolly pine trees in thinned stands quickly expanded their crowns horizontally starting the year following thinning along with the reduction ... During the dormant seasons of 1980–1981 and 1981–1982, permanent plots were established in planted stands of loblolly pine (Pinus taeda L. ) through the native range of the species in the southeastern ... they observed following thin-ning was not long enough to exhibit the full effect of the thin-ning.There have been efforts made at explaining stand develop-ment following thinning. In an attempt...
- 6
- 308
- 0
Báo cáo lâm nghiệp: " Ranking the importance of quality variables for the price of high quality beech timber (Fagus sylvatica L.) ppt
... measured in cm at half of the length of the log) and the log length (in m) were used. The mid diameters of the logs lay between 45.0 and 77.0 cm (mean 57.13 cm) while the length had values from ... indirectlycontrolled by the properties of the goods.Solving the problem was therefore divided into two steps; the analysis of the buyers’ preference and the incorporation of the qualities of the goods ... residuals outsidea range of ± 2 were seen as outliers and eliminated.3.3.2. Testing the quality of the models The quality of the models was not only evaluated by means of the r2(measure of determination)....
- 15
- 296
- 0
Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire" doc
... 2 log likelihood including only the constant of the complete model. The models in bold are the selected ones. The coefficients of the variables in italics are not significant using a probability ... pine and four potential competi-tors following thermal treatment. Finally, conclusions allow the development of management strategies to help regenerateScots pine stands in northern Spain.2. ... models for Pinus sylvestris, Cistus laurifolius, Halimium umbellatum, Halim-ium alyssoides and Genista florida were tested using the ger-mination results after thermal shock. The value of –2 log...
- 7
- 355
- 0
Báo cáo lâm nghiệp: "Assessing the potential of natural woody species regeneration for the conversion of Norway spruce plantations on alluvial soils" doc
... seedlings(< 10 cm tall), old seedlings (≥ 10 cm but < 50 cm tall), short saplings(≥ 50 cm but < 1.5 m tall), tall saplings (≥ 1.5 m tall but < 7 cm dbh).For the 86 Norway spruce plantations, ... soil pH.b Other trees are: Alnus glutinosa, Carpinus betulus, Fagus sylvatica, and Quercus robur.c Young seedlings (< 10 cm tall), old seedlings (≥ 10 cm but < 50 cm tall), short saplings ... Typology of the stands Simplified classifications for the first levels of division of the cluster analysis are given in Figure 2. Norway spruce plan-tations were classified in two groups of stands. ...
- 9
- 329
- 0
Từ khóa: báo cáo lâm nghiệpcách làm báo cáo tốt nghiệphướng dẫn làm báo cáo tốt nghiệp khoa kế toáncách làm bìa báo cáo tốt nghiệpcách làm slide báo cáo tốt nghiệpcách làm báo cáo tốt nghiệp chuyên ngành kế toánNghiên cứu sự biến đổi một số cytokin ở bệnh nhân xơ cứng bì hệ thốngMột số giải pháp nâng cao chất lượng streaming thích ứng video trên nền giao thức HTTPGiáo án Sinh học 11 bài 13: Thực hành phát hiện diệp lục và carôtenôitGiáo án Sinh học 11 bài 13: Thực hành phát hiện diệp lục và carôtenôitĐỒ ÁN NGHIÊN CỨU CÔNG NGHỆ KẾT NỐI VÔ TUYẾN CỰ LY XA, CÔNG SUẤT THẤP LPWANPhối hợp giữa phòng văn hóa và thông tin với phòng giáo dục và đào tạo trong việc tuyên truyền, giáo dục, vận động xây dựng nông thôn mới huyện thanh thủy, tỉnh phú thọPhát triển mạng lưới kinh doanh nước sạch tại công ty TNHH một thành viên kinh doanh nước sạch quảng ninhPhát hiện xâm nhập dựa trên thuật toán k meansNghiên cứu, xây dựng phần mềm smartscan và ứng dụng trong bảo vệ mạng máy tính chuyên dùngNghiên cứu về mô hình thống kê học sâu và ứng dụng trong nhận dạng chữ viết tay hạn chếNghiên cứu khả năng đo năng lượng điện bằng hệ thu thập dữ liệu 16 kênh DEWE 5000Tìm hiểu công cụ đánh giá hệ thống đảm bảo an toàn hệ thống thông tinThiết kế và chế tạo mô hình biến tần (inverter) cho máy điều hòa không khíChuong 2 nhận dạng rui roTăng trưởng tín dụng hộ sản xuất nông nghiệp tại Ngân hàng Nông nghiệp và Phát triển nông thôn Việt Nam chi nhánh tỉnh Bắc Giang (Luận văn thạc sĩ)Nguyên tắc phân hóa trách nhiệm hình sự đối với người dưới 18 tuổi phạm tội trong pháp luật hình sự Việt Nam (Luận văn thạc sĩ)Giáo án Sinh học 11 bài 14: Thực hành phát hiện hô hấp ở thực vậtBÀI HOÀN CHỈNH TỔNG QUAN VỀ MẠNG XÃ HỘIĐổi mới quản lý tài chính trong hoạt động khoa học xã hội trường hợp viện hàn lâm khoa học xã hội việt namTÁI CHẾ NHỰA VÀ QUẢN LÝ CHẤT THẢI Ở HOA KỲ