Treesearch

To better understand hydraulic adaptations of coastal Douglas-fir (Pseudotsuga menziesii var. menziesii(Mirb.) Franco) to local climate, we examined genetic (G) and environmental (E) responses of branch hydraulic architecture of 7-year-old saplings from dry and wet climates of origin grown at a relatively dry and a relatively wet common garden site in western Oregon. We sampled 2 years of branch growth from three dry-source and three wet-source families grown at both sites (72 branches, total). Overall, only 4 of the 11 traits had significant genetic (G) effects, whereas 9 traits had...

Genetic diversity underpins species conservation and management goals, and ultimately determines a species’ ability to adapt. Using freshwater environmental DNA (eDNA) samples, we examined mitochondrial genetic diversity using multigene metabarcode sequence data from four Oncorhynchus species across 16 sites in Oregon and northern California. Our multigene metabarcode panel included targets commonly used in population genetic NADH dehydrogenase 2 (ND2), phylogenetic cytochrome c oxidase subunit 1 (COI) and eDNA (12S ribosomal DNA) screening. The ND2 locus showed the greatest within-species...

Chapters 2 through 19 of this report describe existing research results and monitoring datasets from individual experimental forests and ranges (EFRs) of potential use to water quality regulatory agencies. Research addressing the focus question of biological responses to stream nutrients differs among the reviewed EFRs. For example, all of the reviewed EFRs have studies that might be useful for the reference waterbody approach for developing nutrient criteria, while only some of those EFRs have results that would be applicable to the stressor-response modeling approach. In addition, the...

This chapter is a review and synthesis of research conducted at Luquillo Experimental Forest (LEF) on stream nutrients and biological responses. It is intended to inform national and regional water quality regulatory agencies, such as the U.S. Environmental Protection Agency (EPA) and the Puerto Rico Department of Natural and Environmental Resources, about existing results of relevant scientific studies that are available at LEF, and to identify future field and synthetic research of potential use to regulatory agencies that might be conducted at LEF.

This chapter is a review and synthesis of research conducted at Tenderfoot Creek Experimental Forest (TCEF) on biological responses to stream nutrients. It is intended to inform national and regional water quality regulatory agencies, such as the U.S. Environmental Protection Agency and the Montana Department of Environmental Quality (DEQ), about existing results of relevant scientific studies that are available at TCEF, and to identify future field and synthetic research of potential use to regulatory agencies that might be conducted at TCEF.

This chapter synthesizes environmental monitoring and studies performed at Sagehen Experimental Forest (SHEF) that are relevant to water quality regulatory agencies and suggests research needs of importance to regulators that might be met at SHEF.

This chapter is a review and synthesis of research conducted at Fraser Experimental Forest (FEF) on stream chemical nutrients, contributing factors, and biological responses to them. It is intended to inform national and regional water quality regulatory agencies, such as the U.S. Environmental Protection Agency (USEPA) and the Colorado Department of Public Health and Environment (CDPHE), about existing results of relevant scientific studies that are available at FEF, and to identify future field and synthetic research of potential use to regulatory agencies that might be conducted at FEF.

The Olympic Experimental State Forest (OESF) covers more than 110 000 ha on the western Olympic Peninsula in the state of Washington. The forest consists of state trust lands that are administered by Washington Department of Natural Resources (WADNR). The OESF is a working forest, managed to produce commercial timber sustainably and to provide ecological values, such as biodiversity and long-term site productivity. The OESF has an additional mandate, unlike other state trust lands in western Washington, to experiment with innovative land management practices and to put the research results...

Element biogeochemistry in streams has a long record of study at Hubbard Brook Experimental Forest (HBEF) corresponding to the studies of watershed element cycling. Much of these studies focused on how streams control nutrient transport and storage. Although fewer HBEF studies have addressed how nutrients control stream processes than at some other experimental forests and ranges (EFRs) and long-term ecological research (LTER) sites (Benstead et al. 2009, Davis et al. 2010, Rosemond et al. 2015, Slavik et al. 2004), some studies at HBEF have addressed nutrient or cation enrichment (Hall et...

This chapter is a review and synthesis of research on stream nutrients from the H.J. Andrews Experimental Forest (HJA) located in the western Cascade Mountains of Oregon. This research includes studies, some of which originated in the 1960s, in streams through reference forests and harvested watersheds. In addition to providing foundational information for researchers and managers, the information in this chapter serves to inform national and regional water quality regulatory agencies about results of relevant scientific studies at HJA. The chapter also identifies questions of potential...