In order to assess herb layer productivity, composition and diversity in response to tree diversity, identity and to the Ecoscape as well as to test for changes within the herb layer by phosphate fertilization and no wedding treatments, first data on herb layer composition have been collected in each 35 plots along a tree diversity experiment at two sites, each implying subplots of phosphorous fertilization, annual weeding and no weeding (i.e. Biomass served as a proxy for herb layer productivity in response tree diversity.
In addition, LAI and light measurements were performed.
New insights must be obtained to grasp this multicomplexity of diversity.Within my Ph D project, I aim to add knowledge on strata specific responses to diversity in experimental subtropical forests only rarely studied to date.y Div gives me the chance to profit from a larger interdisciplinary network that allows to assess the multicomplexity of my study system also from multiple scientific perspectives. In forests, the herb layer contributes a great deal to the overall biodiversity, yet is also able to alter tree and shrub diversity and to influence the nutrient content of the ecosystem.As major objectives, we test 1.1.) for increasing effects of tree diversity with diminishing influence of the Ecoscape on the herb layer with the time, 1.2.) for changes in tree diversity effects on the herb layer in different nutrient and competition environments (as mediated by phosphate fertilization and no weeding treatments) 2.) for Janzen-Connell effects by studying woody recruitment, and 3.) for important quantitative contributions of the herb layer to the whole CNP balance of the ecosystem.Accordingly, I assume, that productivity and diversity of the herb layer will be increasingly modified by tree layer diversity and identity with the time, while signals of the Ecoscape will diminish.
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Thereby, one focus is to quantify herb layer characteristics and their feedback effects on the trees along an experimental tree biodiversity gradient.In addition, I study effects of herb layer x tree diversity interactions on tree recruitment and address the role of the herb layer for the nutrient balance of forests.The ur-evidence of this belief is the infamous Clark-Hatfield study, which was published in 1989 and replicated over and over again by You Tube pranksters as “social experiments” ever since. Of course, the study was fatally flawed; as has been pointed out many times, Johnny Rando rolling up on a college campus and asking chicks to bang him betrays a rather severe lack of social calibration at .One of the oldest canards – something I’ve written about before, in fact – is the idea that women don’t like sex, especially casual sex, as much as men do.
It’s the subject of many a heated debate, the punchline to hacky comedians’ jokes and the background noise in movies and sitcoms since pretty much forever.
Nonetheless, most forest biodiversity studies, just as discussions of threats to biodiversity often ignore the functional role of herb layer.
In my Ph D project, integrated within the “BEF-China” Experiment (FOR 891), a large tree diversity experiment in the subtropics, I address the mechanisms behind tree layer x herb layer interactions by taking profound knowledge of environmental covariation (quantified as the Ecoscape) into account.
In this project, I partition forest diversity into structural components by studying the pattern and emergence of herb layer diversity in response to the tree layer diversity and to tree identity as well as to the Ecoscape.
By testing for Janzen-Connell effects, I study effects of biotic components of the Ecoscape on tree layer responses As explanation for the maintenance of biodiversity, I test whether and to what extent regular weeding, phosphorus fertilization and canopy closure can alter herb layer diversity.