Báo cáo lâm nghiệp: "The effect of nitrogen content on the of Scots pine needles and shoots photosynthesis" doc

... The effect of nitrogen content on the photosynthesis of Scots pine needles and shoots H. Smolander 1 P. Oker-Blom 2 The Finnish Forest Research Institute, Suonenjoki ... photosynthesis of conif- erous trees (Linder and Rook, 1984). The aim of this study was to analyze separate- ly the effect of nitrogen content on the photo...

Ngày tải lên: 09/08/2014, 04:20

... relationship between the crown health status of oaks and the C. fusipes root infection index, the depth of waterlogging signs (traces of iron deposition or depletion) and the depth of gravel layer ... number of fine roots per length of mother roots (t value of –1.35 and probabil- ity of 0.189) or the dry weight of fine roots per dry weight of mother roots (...

Ngày tải lên: 08/08/2014, 01:21

... types on the northern slope of the Natural Reserve Zone of Changbai Mountain. The elevation influence on soil C and N mineralization was also discussed. The results indicated that for the given ... mineralization, but the effect on NH 4 + -N mineralization was not significant. The complex mechanism of their impact on the soil C and Nmineralization of...

Ngày tải lên: 07/08/2014, 10:21

... competi- tion-crop relationships. The different soil temperature profiles during the establish- ment phase of non-crop vegetation on the two sites illustrates the different competition dynamics. The ... of release treatments. The objectives of this study were first, to quantify the net effect of non-crop vegetation on soil temperature and light attenuation during...

Ngày tải lên: 08/08/2014, 01:21

... proportional to the third root of illumination time t and to the square of the third root of incident light intensity I: Under certain preconditions the variations in photoconductivity ... measurements rather than great accuracy". Since the size of the sample test and the duration of the measuring period have considerable influe...

Ngày tải lên: 08/08/2014, 18:21

... the focus of the biplot scaling was on stands the relationships among stands are based on euclidean distance interpretation, whereas among species and stands the relation- ships ... radiation on the ground as determined by the slope, the aspect and the lati- tude of the plot; Gandullo, 1974), (14) complexity of the sumoundings (i...

Ngày tải lên: 08/08/2014, 18:22

... be extended to other species of the 5 sections of the genus Populus. Moreover, extraction and use of these specific glycoproteins implicated in pollen-pistil recognition could be ... exine (Figs. 1 and 2). The presence of a great amount of osmiophilic components in the pollen coat is observed within the arcades of the exine (Fig....

Ngày tải lên: 09/08/2014, 04:20

... a long-lasting effect. This paper briefly reports the results of an investigation into the long-lastinc l effects of ozone fumiga- tion upon photosynthesis of Norway spruce. ... in contradiction with the data of large numbers of papers reporting that ozone fumigation causes decreased rates of assimilation (A). However, examples of ozone fum...

Ngày tải lên: 09/08/2014, 04:20

... association with ozone affecting the stands. e increase in ozone concentrations after the second intervention was evident on all plots – indicating the absence of connection with the individual ... seasons 1999–2006, was focussed on the identification and analysis of the impact of proton load (H + ) and ground level ozone (O 3 ) on beech stands differentiated b...

Ngày tải lên: 07/08/2014, 03:22

... restoration was considered as a consequence reflecting the devel- opment of regenerated forest stand. Under such conditions, the fluctuation of runoff can be related to the loss and restoration of ... curve depend on the particular duration of rainfall and amount of precipitation since both physical and terrain conditions of watershed are considered constant. ...

Ngày tải lên: 07/08/2014, 10:21