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Quantifying soil P fractions is essential for understanding soil P cycling because these fractions are potential sources of bioavailable P. Here, we investigated whether soil P fractions (i.e., labile inorganic P [Pi], intermediately available Pi, organic P, occluded P, and apatite P) differed among three tropical forests at different stages of succession(More)
The coexistence of woody plants and grasses in savannas is determined by a complex set of interacting factors that determine access to resources and demographic dynamics, under the control of external drivers and vegetation feedbacks with the physical environment. Existing theories explain coexistence mainly as an effect of competitive relations and/or(More)
The relationship between species richness and productivity has been a central issue in community ecology, and this issue has resulted in much debate in the ecological literature. To evaluate whether species richness is consistently associated with productivity and the underlying mechanisms, a potted experiment with various combinations of three perennial(More)
Abiotic drivers of environmental stress have been found to induce CAM expression (nocturnal carboxylation) in facultative CAM species such as Mesembryanthemum crystallinum. The role played by biotic factors such as competition with non-CAM species in affecting CAM expression, however, remains largely understudied. This research investigated the effects of(More)
  • Kailiang Yu, Wei Xu, Yi Liu, Jianping Gao
  • IECON 2017 - 43rd Annual Conference of the IEEE…
  • 2017
The brushless doubly-fed induction generator (BDFIG) shows commercial potential for the wind-power generation and ship shaft power generation due to its brushless operation as compared with doubly-fed induction generator. This paper proposes an improved vector control scheme oriented on the power winding flux reference frame to achieve stable stand-alone(More)
Savannas are characterized by the coexistence of trees and flammable grasses. Yet, tree–grass coexistence has been labeled as paradoxical—how do these two functional groups coexist over such an extensive area, despite being generally predisposed to excluding each other? For instance, many trees develop dense canopies that limit grass growth, and many(More)
Determining which strategies confer a competitive advantage in variable environments with strong short-term resource fluctuations (i.e., seasonal drought and flooding) is critical for understanding ecosystem structure and function, and predicting how ecosystems will respond to global change. Here, we ask how functional traits of plant species vary in(More)
Feeding a growing populationwhileminimizing environmental degradation is a global challenge requiring thoroughly rethinking food production and consumption. Dietary choices control food availability and natural resource demands. In particular, reducing or avoiding consumption of low production efficiency animal-based products can spare resources that can(More)
Plants with crassulacean acid metabolism (CAM) are increasing their abundance in drylands worldwide. The drivers and mechanisms underlying the increased dominance of CAM plants and CAM expression (i.e., nocturnal carboxylation) in facultative CAM plants, however, remain poorly understood. We investigated how nutrient and water availability affected(More)
Complex systems can undergo abrupt state transitions near critical points. Theory and controlled experimental studies suggest that the approach to critical points can be anticipated by critical slowing down (CSD), that is, a characteristic slowdown in the dynamics. The validity of this indicator in field ecosystems, where stochasticity is important in(More)