
Early effect of target tree management on carbon storage in Pinus massoniana plantations
LUO Yan, HE Pengjun, LYU Qian, FAN Chuan, FENG Maosong, LI Xianwei, CHEN Luman
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (2) : 206-214.
Early effect of target tree management on carbon storage in Pinus massoniana plantations
【Objective】 Increasing atmospheric greenhouse gas concentrations have led to an increase in the attention toward the causes and effects of global warming. Protecting existing plantation carbon storage and carrying out scientific forest management activities have become important measures to improve the structure of forest stands and enhance terrestrial carbon sinks. 【Method】 A 33-year-old Pinus massoniana plantation in Huaying City, eastern Sichuan, China, was used to analyze the variations of Pinus massoniana carbon storage on the basis of target tree density. 【Result】 We adopted a target tree density of 100 (H1), 150 (H2) and 200 (H3) plants/hm2 for our study. The results showed that, compared with the control forest (HCK), the storage changes of the arbor layer (organs) and the understory of the target tree were significantly different (P < 0.05) but that there was no significant difference in soil layer carbon storage between different treatments ( P > 0.05). The carbon storage growth of the arbor layer was 15.65%, 18.70% and 16.59% for H1, H2 and H3, respectively, which was higher than 13.4% for HCK. The average carbon storage growth of stem, branch, leaf, root and whole tree in the target tree were higher than 66.04%, 51.25%, 52.09%, 48.81% and 38.67% for HCK; these values higher than that of ordinary trees. The range of carbon storage in each organ was trunk > root > branch > leaf. The carbon storage in the herb layer was H2>H3>H1>HCK, and the rest of them were H3>H2>H1>HCK. Carbon storage of the soil layer was 244.86 t/hm 2 and accounted for 76.44% of the total carbon storage in the plantation, but the carbon storage in the soil surface (0-5 cm) accounted for 45.52% of the soil layer (0-40 cm). A trend of significant reduction in carbon storage was observed with an increase in soil depth. The spatial distribution of the carbon pool of Pinus massoniana plantation was soil layer (0-40 cm) > arbor layer > shrub layer > herb layer > litter layer > crude wood residue layer.【Conclusion】 Target tree management can increase the carbon storage of Pinus massoniana plantations, and the carbon storage in Pinus massoniana plantations with a density of 150 target trees per hectare was the highest.
target tree management / carbon storage / Pinus massoniana plantation / ecosystem / arbor layer / soil layer / understory layer
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