Pine needles are excellent for compost and can be ..

Due to the large amount of surface area, pine needle mulch will allow water to pass through the top soil, allowing for quicker absorption of nutrients by the root system. The lush green colour of the pine needles implies a high concentration of nitrogen (the most important nutrient for plant growth). Nitrogen is a major part of chlorophyll, chlorophyll is what gives plants their vibrant green colour, it is also a key component in the process of photosynthesis aiding in the growth and sustenance of all plant life.

Pine needle miner larvae feed inside needles causing them to turn yellow and dry up.

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Christmas Trees: Pine and PVC Needles | Biology to …

reported that a 210-ppm increase in the air s CO2 content boosted.Photosynthesis and Respiration.

AB - Leaf responses to elevated atmospheric CO 2 concentration (C a) are central to models of forest CO 2 exchange with the atmosphere and constrain the magnitude of the future carbon sink. Estimating the magnitude of primary productivity enhancement of forests in elevated C a requires an understanding of how photosynthesis is regulated by diffusional and biochemical components and up-scaled to entire canopies. To test the sensitivity of leaf photosynthesis and stomatal conductance to elevated C a in time and space, we compiled a comprehensive dataset measured over 10 years for a temperate pine forest of Pinus taeda, but also including deciduous species, primarily Liquidambar styraciflua. We combined over one thousand controlled-response curves of photosynthesis as a function of environmental drivers (light, air C a and temperature) measured at canopy heights up to 20 m over 11 years (1996-2006) to generate parameterizations for leaf-scale models for the Duke free-air CO 2 enrichment (FACE) experiment. The enhancement of leaf net photosynthesis (A net) in P. taeda by elevated C a of +200 μmol mol -1 was 67% for current-year needles in the upper crown in summer conditions over 10 years. Photosynthetic enhancement of P. taeda at the leaf-scale increased by two-fold from the driest to wettest growing seasons. Current-year pine foliage A net was sensitive to temporal variation, whereas previous-year foliage A net was less responsive and overall showed less enhancement (+30%). Photosynthetic downregulation in overwintering upper canopy pine needles was small at average leaf N (N area), but statistically significant. In contrast, co-dominant and subcanopy L. styraciflua trees showed A net enhancement of 62% and no A net-N area adjustments. Various understory deciduous tree species showed an average A net enhancement of 42%. Differences in photosynthetic responses between overwintering pine needles and subcanopy deciduous leaves suggest that increased C a has the potential to enhance the mixed-species composition of planted pine stands and, by extension, naturally regenerating pine-dominated stands.

See List of Lepidoptera that feed on pines

What kinds of leaves.
Pine trees have adapted to winter weather and a shorter growing season with a conical tree shape that allows them to shed snow, and by staying green year-round.
pine trees, photosynthesis, good question: You ask a very good question.

Leaf Shapes and Strategies - Pennsylvania State University

Photosynthesis is the process by which plants and other Pine trees and other conifers have evolved over the years to grow in a triangle.
The products of photosynthesis are sugars and polysaccharides.