Climate and anthropogenic controls on the carbon cycle of Xingyun Lake, China

摘要: Abstract The organic and inorganic carbon cycles in lakes are responsive to both natural climate variability human-induced environmental changes. Here we present an 8600-year sediment record from Xingyun Lake Yunnan, China that provides insight into cycling lake primary productivity using stable isotope measurements of nitrogen, nitrogen ratio, isotopes, mass accumulation rates carbon, calcite. early middle Holocene is characterized by relative stability most proxies although some variation isotopes reflects fluctuating terrestrial matter inputs. late Holocene, 5300 3300 years BP, marked amplified nearly all suggests either increased C4 vegetation or productivity. These changes coincident with declining levels aridity throughout the Indian Summer Monsoon region. After greatest coincides closely human settlement accompanied further indications productivity, suggesting eutrophic conditions. While cannot definitively link activity these changes, balance evidence other mechanisms unlikely. This study supports previous work anthropogenic activities began measurably impacting landscape southwestern within last few millennia.