Báo cáo lâm nghiệp: "Nitrate utilization and communities nitrogen status in English woodland" ppt

... of asparagine. Both glutamate and alanine increased as leaf NR activity increased. Rhodes et aL (1976) found that glutamate and alanine pools increased in Lemna minor as nitrate ... assimilation of !5N-labelled nitrate in rice seedlings. Plant Cell Physiol. 16, 21-26 Nitrate utilization and nitrogen status in English woodland communities E...

Ngày tải lên: 09/08/2014, 04:20

... in a high flow of soil water since the evapotran- spiration is low during the winter months [31, 38, 39]. The risk of nitrogen leaching was therefore high in CDSC during the winter months, since ... results indicate an elevated risk for increased nitrogen leaching in CDSC compared to C, FVC and PDSC. However, the elevated nitrogen concentration in the soil water was not repeat...

Ngày tải lên: 08/08/2014, 01:21

... area index (PAI, including leaf and skeleton indexes) by conventional gap fraction analy- sis of hemispherical photography and reported values of 34 and 63% of that determined destructively in ... stand LAI was about 0.96 when expressed per total orchard area. The same value of LAI was obtained when inte- grating “horizontally” individual trees or when integrating all canopy layers i...

Ngày tải lên: 07/08/2014, 16:21

... pre-zygotic incompat- ibility between ovules and self-pollinating pollen grains is not assumed and, most likely, the first fertilizing male gamete is derived from the first pollinating pollen grain, ... strobili to open pollination, self-pollination was tested: several branches containing both male and female generative structures were isolated together using waxed paper bags. Within the...

Ngày tải lên: 08/08/2014, 00:21

... Throughfall and stemflow chemistry in a northern hardwood forest, J. Ecol. 61 (1973) 495– 508. [12] Edwards P.J., Studies of mineral cycling in a montane rain forest in New Guinea. Rates of cycling in ... Nakagawa Y., Rainfall and forest runoff chemistry: The 30-year change in the amount of dissolved elements in rainwater, input output budget of elements in rainfall and ru...

Ngày tải lên: 08/08/2014, 00:21

... and polished using sand-paper of progressively finer grain. Then, they were cross- dated using characteristic tree-rings, mainly narrow (e.g., 1965, 1986) and light rings (e.g. 1963, 1972). In ... occurred in codominant and dominant trees (Tab. IV). No brooms were observed in subdo- minant trees. All brooms in codominant trees were observed on the trunk, and 79% of the brooms...

Ngày tải lên: 08/08/2014, 00:22

... CO 2 concentration will induce higher photosyn- thetic rates in herbaceous C3 plants and also in trees (Ceulemans and Mousseau, 1994). However, initial increases in photo- synthesis ... 1991) and in Pinus taeda L (Teskey, 1995). These direct effects, reviewed by Amthor (1991), have been sug- gested to involve changes in the intercellu- lar p...

Ngày tải lên: 08/08/2014, 18:21

... fluid. The cross-pollinated seed lot was clear- ly the best for the variables: seed produc- tion/capsule, rate of germination and seedling survival, and the self-pollinated lot was ... This trend was also found in subsequent growth in the field. Frost tolerance These results suggest that hardening had no effect on frost resistance in the crosses...

Ngày tải lên: 09/08/2014, 04:20

... to interpret the foliage and soil analyses, and to find possible indications in the soil-plant relation in Scots pine stands. MATERIAL AND METHODS Wood ash and nitrogen experiment, containing ... production and nitrogen use in Scots pine stands in Eastern Finland. Forest Ecology and Management, 165: 317–326. INGERSLEV M., 1998. Vitalization of mature Norway spruce...

Ngày tải lên: 07/08/2014, 03:22

... by an individual collecting of adults. During sweeping and beating, 30 sweepings or beatings were carried out in each locality. Caught psocids were sucked into the exhauster and stored in a ... according to species ordinate in particular vectors and accord- ing to abundance of particular species (indicators) as well. ese indicators are automatically selected by the program...

Ngày tải lên: 07/08/2014, 03:22