Showing papers in "Journal of Jiangsu Forestry Science & Technology in 2015"

Effect of parasitism of Tetrastichus nigricoxae Yang on the encapsulation response of its host,Micromelalopha troglodyta Graeser pupae and toxicity of its venom to pupal host

Abstract: Experiments were made to determine the effect of parasitism of Tetrastichus nigricoxae Yang on the encapsulation response of its host,Micromelalopha troglodyta Graeser pupae and toxicity of its venom to pupal host. We found out that the hemocyte-mediated encapsulation towards the injected Sephadex A-25 beads in the pupae of M. troglodyta was as high as94. 00%. This ability would lose after being parasitised by T. nigricoxae Yang. Parasitism did not affect in vivo encapsulation response of pupae to injected Sephadex A-25 beads in early stage( 0 ~ 2 h after parasitism),but did affect the response in later stage( 24 and 48 h after parasitism). Pseudoparasitism trigged by C60-γ ray irradiation influenced host's encapsulation in a similar way as normal parasitism,and the parsitized and pseudoparasitized pupae both died about 48 h after parasitism. The injection of venom could lead the recipient pupae to death,confirming a toxic action of venom.

Carbon storage and distribution in poplar and poplar-crop intercropping forests

Abstract: Carbon storage and distribution in poplar and poplar-crop intercropping forests were studied in Dafeng Farm,north of Jiangsu Province. We concluded that the carbon storages of poplar and poplar-crop agro-forestry ecosystem were( 101. 59 ± 8. 1) and( 116. 65 ± 10. 3) t/hm2 respectively. And the soil and wood carbon storage were more than 90% of the total in both ecosystems. The carbon storage of undergrowth vegetations and litter-fall was about 6% in poplar-crop agroforestry ecosystem,twice of that in poplar forest. There was significant difference in soil carbon storage between poplar and poplar-crop agro-forestry ecosystem within the soil layers 10 ~ 25 and 50 ~ 100 cm. Carbon storages in the harvested parts( woods and undergrowth vegetations) of poplar forest were significantly lower than that in poplar-crop agro-forestry ecosystem. The carbon return in litter-fall showed no differences between two ecosystems. The results showed the agro-forestry ecosystem had relatively a high potential in carbon absorption and sequestration.

Research advances on genetic engineering breeding of poplar

Abstract: The research progress and achievements made in poplar genetic modification breeding in recent years are summarized in terms of pest resistance,disease resistance,herbicide resistance,drought resistance and another stress resistance,lignin reduction,and male sterility. Some existent problems were discussed and corresponding countermeasures offered.