Figure 1 Area and volume of planted forests in China over the last forty years.
At the stand level, volume of planted conifers did not increase with hexazinone rate for jack pine, but increased significantly for both container and bareroot black spruce.
and Masson's pine (Pinus massoniana Lamb)., accounting for 60% of total area of planted high forest and 66% of total volume of planted high forest (Table 2) respectively.
The top five provinces are Guangxi, Guangdong, Hunan, Sichuan and Yunnan, reaching 25.3 million ha, accounting for 37% of the total area and 31% of the total stocking volume of planted forests, respectively.
Since major reforestation and afforestation work in China began in the 1970s and gathered momentum thereafter, the young and middle-aged classes dominate the forest landscape accounting for nearly 72% of the total area of planted high forest and 52% of the total stocking volume of planted high forest (Table 3), respectively.
The planted forests in China are unevenly distributed across the whole country, with greater concentration in the warmer and wetter south and southwest regions, accounting for 63% of the total area and 62% of the total stocking volume of planted forests, respectively (Table 4).
To account for possible effects of initial size differences between knotweed rhizomes and native plant seedlings, we initially included the volumes of planted knotweed rhizomes and the sizes of native plant seedlings as covariates in the analyses.
Mean annual volume increment of planted Scots pine forests was 5.6 9.2 m3/ha, which is approximately 15%% greater than the volume increment of natural Scots pine forests.
Speaking recently in a House of Lords debate, he pointed out that rising volumes of atmospheric carbon dioxide have pushed up the volume of plants and crops, adding: "Fossil fuels do not have anything to be ashamed of, and have much to be proud of".
The native prairie mix (28.57 kg m−2) also had high carbon content, because of the high volume of plant biomass.
